Publications (112)
Forward asteroseismic modeling of stars with a convective core from gravity-mode oscillations: parameter estimation and stellar model selection
C. Aerts, G. Molenberghs, M. Michielsen +13
We propose a methodological framework to perform forward asteroseismic modeling of stars with a convective core, based on gravity-mode oscillations. These probe the near-core regio…
Kepler's first view of O-star variability: K2 data of five O stars in Campaign 0 as a proof-of-concept for O-star asteroseismology
B. Buysschaert, C. Aerts, S. Bloemen +9
We present high-precision photometric light curves of five O-type stars observed with the refurbished {\it Kepler\/} satellite during its Campaign 0. For one of the stars, we also…
Detecting non-uniform period spacings in the Kepler photometry of gamma Doradus stars: methodology and case studies
T. Van Reeth, A. Tkachenko, C. Aerts +9
Context. The analysis of stellar oscillations is one of the most reliable ways to probe stellar interiors. Recent space missions such as Kepler have provided us with an opportunity…
Internal rotation of the red-giant star KIC 4448777 by means of asteroseismic inversion
M . P. Di Mauro, R. Ventura, D. Cardini +13
In this paper we study the dynamics of the stellar interior of the early red-giant star KIC 4448777 by asteroseismic inversion of 14 splittings of the dipole mixed modes obtained f…
On the photometric detection of Internal Gravity Waves in upper main-sequence stars I. Methodology and application to CoRoT targets
D. M. Bowman, C. Aerts, C. Johnston +8
Context. Main sequence stars with a convective core are predicted to stochastically excite Internal Gravity Waves (IGWs), which effectively transport angular momentum throughout th…
KIC 11285625: a double-lined spectroscopic binary with a gamma Dor pulsator discovered from Kepler space photometry
J. Debosscher, C. Aerts, A. Tkachenko +8
We present the first binary modelling results for the pulsating eclipsing binary KIC 11285625, discovered by the Kepler mission. An automated method to disentangle the pulsation sp…
High-mass eclipsing binaries: a testbed for models of interior structure and evolution -- Accurate fundamental properties and surface chemical composition for V1034 Sco, GL Car, V573 Car and V346 Cen
K. Pavlovski, J. Southworth, A. Tkachenko +2
The surface chemical compositions of stars are affected by physical processes which bring the products of thermonuclear burning to the surface. Despite their potential in understan…
Pushing Least-Squares Deconvolution to the next level: application to binary stars
A. Tkachenko, V. Tsymbal, Zvyagintsev +3
Eclipsing, spectroscopic double-lined (SB2) binaries remain to be the prime source of precise and accurate fundamental properties of stars. Furthermore, high-cadence spectroscopic…
MOCKA -- A PLATO mock asteroseismic catalogue: Simulations for gravity-mode oscillators
N. Jannsen, A. Tkachenko, P. Royer +14
With ESA's PLATO space mission set for launch in December 2026, a new photometric legacy and a future of new scientific discoveries await. In this work we investigate PLATO's poten…
Oscillating red giants in eclipsing binary systems: empirical reference value for asteroseismic scaling relation
N. ThemeÃl, S. Hekker, J. Southworth +10
The internal structures and properties of oscillating red-giant stars can be accurately inferred through their global oscillation modes (asteroseismology). Based on 1460 days of Ke…
The SRG X-ray orbital observatory, its telescopes and first scientific results
R. Sunyaev, V. Arefiev, V. Babyshkin +39
The orbital observatory Spectrum-Roentgen-Gamma (SRG), equipped with the grazing-incidence X-ray telescopes Mikhail Pavlinsky ART-XC and eROSITA, was launched by Roscosmos to the L…
The interior angular momentum of core hydrogen burning stars from gravity-mode oscillations
C. Aerts, T. Van Reeth, A. Tkachenko
A major uncertainty in the theory of stellar evolution is the angular momentum distribution inside stars and its change during stellar life. We compose a sample of 67 stars in the…
Spectrum Analysis of Bright Kepler late B- to early F- Stars
A. Tkachenko, H. Lehmann, B. Smalley +1
The Kepler satellite mission delivers single band-pass light curves of a huge number of stars observed in the Cygnus-Lyra region opening a new window for asteroseismology. In order…
PlatoSim: An end-to-end PLATO camera simulator for modelling high-precision space-based photometry
N. Jannsen, J. De Ridder, D. Seynaeve +21
PLAnetary Transits and Oscillations of stars (PLATO) is the ESA M3 space mission dedicated to detect and characterise transiting exoplanets including information from the asterosei…
A comprehensive study of young B stars in NGC 2264: I. Space photometry and asteroseismology
K. Zwintz, E. Moravveji, P. I. Papics +9
Space photometric time series of the most massive members of the young open cluster NGC 2264 allow us to study their different sources of variability down to the millimagnitude lev…
Spectroscopically resolving the Algol triple system
V. Kolbas, K. Pavlovski, J. Southworth +7
Algol ( Persei) is the prototypical semi-detached eclipsing binary and a hierarchical triple system. From 2006 to 2010 we obtained 121 high-resolution and high-S/N échelle spe…
Constraining stellar physics from red-giant stars in binaries - stellar rotation, mixing processes and stellar activity
P. G. Beck, T. Kallinger, K. Pavlovski +10
The unparalleled photometric data obtained by NASA's Kepler Space Telescope has led to an improved understanding of stellar structure and evolution - in particular for solar-like o…
SRG/ART-XC all-sky X-ray survey: Catalog of sources detected during the first year
M. Pavlinsky, S. Sazonov, R. Burenin +20
We present a first catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope on board the SRG observatory in the 4-12 keV energy band during its ongoing all-sky survey.…
Probing high-mass stellar evolutionary models with binary stars
A. Tkachenko
Mass discrepancy is one of the problems that is pending a solution in (massive) binary star research field. The problem is often solved by introducing an additional near core mixin…
SRG/ART-XC all-sky X-ray survey: Catalog of sources detected during the first five surveys
S. Sazonov, R. Burenin, E. Filippova +27
We present an updated catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope aboard the Spektrum-Roentgen-Gamma (SRG) observatory during its all-sky survey. It is ba…
Spectroscopic time-series analysis of R Canis Majoris
H. Lehmann, V. Tsymbal, F. Pertermann +3
R Canis Majoris is the prototype of a small group of Algol-type stars showing short orbital periods and low mass ratios. A previous detection of short-term oscillations in its ligh…
The CubeSpec space mission: Asteroseismology of massive stars from time-series optical spectroscopy
D. M. Bowman, B. Vandenbussche, H. Sana +8
The ESA/KU Leuven CubeSpec mission is specifically designed to provide low-cost space-based high-resolution optical spectroscopy. Here we highlight the science requirements and cap…
Accurate stellar parameters and distance to two evolved eclipsing binary systems, OGLE-BLG-ECL-123903 and OGLE-BLG-ECL-296596, towards the Galactic bulge
K. Suchomska, D. Graczyk, G. PietrzyÅski +15
Aim: Our aim is to obtain high-accuracy measurements of the physical and orbital parameters of two evolved eclipsing binary systems, and to use these measurements to study their ev…
Fundamental parameters and abundance analysis of the components in the SB2 system HD 60803
T. Ryabchikova, S. Zvyagintsev, A. Tkachenko +3
We performed a detailed spectroscopic study of the SB2 system HD 60803 based on high-resolution spectra obtained with the different spectrographs. The analysis was done with two in…
A new universal cosmic-ray knee near the magnetic rigidity 10 TV with the NUCLEON space observatory
E. Atkin, V. Bulatov, V. Dorokhov +18
Data from the NUCLEON space observatory give a strong indication of the existence of a new universal cosmic ray "knee", which is observed in all groups of nuclei, including heavy n…
The BinaMIcS project: understanding the origin of magnetic fields in massive stars through close binary systems
E. Alecian, C. Neiner, G. A. Wade +11
It is now well established that a fraction of the massive (M>8 Msun) star population hosts strong, organised magnetic fields, most likely of fossil origin. The details of the gener…
HD 181068: A Red Giant in a Triply-Eclipsing Compact Hierarchical Triple System
A. Derekas, L. L. Kiss, T. Borkovits +41
Hierarchical triple systems comprise a close binary and a more distant component. They are important for testing theories of star formation and of stellar evolution in the presence…
V772 Cas: an ellipsoidal HgMn star in an eclipsing binary
O. Kochukhov, C. Johnston, J. Labadie-Bartz +4
The late B-type star V772 Cas (HD 10260) was previously suspected to be a rare example of a magnetic chemically peculiar star in an eclipsing binary system. Photometric observation…
The symphony of pulsations and binarity among massive stars using HERMES spectroscopy and TESS photometry
K. Thomson-Paressant, D. M. Bowman, F. Nardini +16
A wide range of variability mechanisms exist among intermediate mass and massive stars, which are not yet fully understood. Using complementary data sources for a large population…
KIC 10526294: a slowly rotating B star with rotationally split, quasi-equally spaced gravity modes
P. I. Pápics, E. Moravveji, C. Aerts +4
Massive stars are important for the chemical enrichment of the universe. Since internal mixing processes influence their lives, it is very important to place constraints on the cor…
Offline Software and Computing for the SPD experiment
V. Andreev, A. Belova, A. Galoyan +16
The SPD (Spin Physics Detector) is a planned spin physics experiment in the second interaction point of the NICA collider that is under construction at JINR. The main goal of the e…
Spectroscopic long-term monitoring of RZ Cas -- Part I: Basic stellar and system parameters
H. Lehmann, A. Dervisoglu, D. E. Mkrtichian +3
RZ Cas is a short-period Algol-type system showing episodes of mass transfer and Delta Sct-like oscillations of its mass-gaining primary component. We analyse high-resolution spect…
Pulsating red giant stars in eccentric binary systems discovered from Kepler space-based photometry
P. G. Beck, K. Hambleton, J. Vos +30
The unparalleled photometric data obtained by NASA's Kepler space telescope led to an improved understanding of red giant stars and binary stars. Seismology allows us to constrain…
The CubeSpec space mission. I. Asteroseismology of massive stars from time series optical spectroscopy: science requirements and target list prioritisation
D. M. Bowman, B. Vandenbussche, H. Sana +7
Context. There is currently a niche for providing high-cadence, high resolution, time-series optical spectroscopy from space, which can be filled by using a low-cost cubesat missio…
Wide-field X-ray observations of the supernova remnant Puppis A with the SRG/ART-XC telescope
R. Krivonos, V. Arefiev, I. Lapshov +8
The Spectrum-Roentgen-Gamma (SRG) observatory is currently conducting its 4-year all-sky X-ray survey, started on December 12, 2019. The survey is periodically interrupted for tech…
Stellar modelling of Spica, a high-mass spectroscopic binary with a beta Cep variable primary component
A. Tkachenko, J. M. Matthews, C. Aerts +16
Binary stars provide a valuable test of stellar structure and evolution, because the masses of the individual stellar components can be derived with high accuracy and in a model-in…
Two new SB2 binaries with main sequence B-type pulsators in the Kepler field
P. I. Pápics, A. Tkachenko, C. Aerts +15
Context: OB stars are important in the chemistry and evolution of the Universe, but the sample of targets well understood from an asteroseismological point of view is still too lim…
A search for magnetic Scuti stars in Kepler hybrid candidates
K. Thomson-Paressant, C. Neiner, P. Lampens +4
Numerous candidate hybrid stars of type Scuti - Doradus have been identified with the Kepler satellite. However, many of them lie outside the theoretically expected insta…
Low-frequency variations of unknown origin in the Kepler Delta Scuti star KIC 5988140 = HD 188774
P. Lampens, A. Tkachenko, H. Lehmann +9
We used high-quality Kepler photometry and spectroscopic data to investigate the Kepler binary candidate KIC 5988140. Using the spectrum synthesis method, we derived the fundamenta…
Orbital and Physical Properties of the Pleiades Binary 27 Tau (Atlas)
G. Torres, A. Tkachenko, K. Pavlovski +12
We report new spectroscopic and interferometric observations of the Pleiades binary star Atlas, which played an important role nearly three decades ago in settling the debate over…
HD 41641: A classical Sct-type pulsator with chemical signatures of an Ap star
A. Escorza, K. Zwintz, A. Tkachenko +8
Among the known groups of pulsating stars, Sct stars are one of the least understood. Theoretical models do not predict the oscillation frequencies that observations reveal. C…
Detection of gravity modes in the massive binary V380 Cyg from Kepler spacebased photometry and high-resolution spectroscopy
A. Tkachenko, C. Aerts, K. Pavlovski +17
We report the discovery of low-amplitude gravity-mode oscillations in the massive binary star V380 Cyg, from 180 d of Kepler custom-aperture space photometry and 5 months of high-r…
Dynamical parallax, physical parameters and evolutionary status of the components of the bright eclipsing binary α Draconis
K. Pavlovski, C. A. Hummel, A. Tkachenko +13
Altough both components of the bright eclipsing binary Dra having been resolved using long baseline interferometry and the secondary component shown to contribute some 15\% of…
SRG/ART-XC and NuSTAR observations of the X-ray pulsar GRO J1008-57 in the lowest luminosity state
A. Lutovinov, S. Tsygankov, S. Molkov +6
We report results of the first broadband observation of the transient X-ray pulsar GRO J1008-57 performed in the quiescent state. Observations were conducted quasi-simultaneously w…
Spectroscopic and seismic analysis of red giants in eclipsing binaries discovered by Kepler
M. Benbakoura, P. Gaulme, J. McKeever +8
Eclipsing binaries (EBs) are unique benchmarks for stellar evolution. On the one hand, detached EBs hosting at least one star with detectable solar-like oscillations constitute ide…
Hard X-rays and QPO in Swift J1727.8-1613: the rise and plateau of the 2023 outburst
I. Mereminskiy, A. Lutovinov, S. Molkov +5
We report on the detection of type-C quasi-periodic oscillations during the initial stages of the outburst of Swift J1727.8-1613 in 2023. Using data of the INTEGRAL observatory alo…
Combined asteroseismology, spectroscopy, and astrometry of the CoRoT B2V target HD 170580
C. Aerts, M. G. Pedersen, E. Vermeyen +9
Space asteroseismology reveals that stellar structure and evolution models of intermediate- and high-mass stars are in need of improvement in terms of angular momentum and chemical…
The PLATO field selection process. II. Characterization of LOPS2, the first long-pointing field
V. Nascimbeni, G. Piotto, J. Cabrera +26
PLAnetary Transits and Oscillations of stars (PLATO) is an ESA M-class mission to be launched by the end of 2026 to discover and characterize transiting planets around bright and n…
KIC 7955301: a hierarchical triple system with eclipse timing variations and an oscillating red giant
P. Gaulme, T. Borkovits, T. Appourchaux +13
KIC 7955301 is a hierarchical triple system with eclipse timing and depth variations discovered by the Kepler mission. It is composed of a non-eclipsing primary star at the bottom…
Detection of a large sample of Gamma Dor stars from Kepler space photometry and high-resolution ground-based spectroscopy
A. Tkachenko, C. Aerts, A. Yakushechkin +10
The space-missions MOST, CoRoT, and Kepler deliver a huge amount of high-quality photometric data suitable to study numerous pulsating stars. Our ultimate goal is a detection and a…
The magnetic field of zeta Orionis A
A. Blazère, C. Neiner, A. Tkachenko +3
Zeta Ori A is a hot star claimed to host a weak magnetic field, but no clear magnetic detection was obtained so far. In addition, it was recently shown to be a binary system compos…
Internal rotation of red giants by asteroseismology
M. P. Di Mauro, D. Cardini, R. Ventura +12
We present an asteroseismic approach to study the dynamics of the stellar interior in red-giant stars by asteroseismic inversion of the splittings induced by the stellar rotation o…
The orbits of subdwarf B + main-sequence binaries. I: The sdB+G0 system PG 1104+243
J. Vos, R. H. Ãstensen, P. Degroote +18
The predicted orbital period histogram of an sdB population is bimodal with a peak at short (< 10 days) and long (> 250 days) periods. Observationally, there are many short-period…
Detection of period-spacing patterns due to the gravity modes of rotating dwarfs in the TESS southern continuous viewing zone
S. Garcia, T. Van Reeth, J. De Ridder +3
Context: the theory of stellar evolution presents shortcomings when confronted with asteroseismic probes of interior physical properties. The differences between observations and t…
The discovery of a planetary candidate around the evolved low-mass Kepler giant star HD 175370
M. Hrudková, A. Hatzes, R. Karjalainen +20
We report on the discovery of a planetary companion candidate with a minimum mass Msini = 4.6 M_J orbiting the K2 III giant star HD 175370 (KIC 007940959). This star was a target i…
Photometric detection of internal gravity waves in early-type stars observed by CoRoT
D. M. Bowman, C. Aerts, C. Johnston +8
Early-type stars are predicted to excite an entire spectrum of internal gravity waves (IGWs) at the interface of their convective cores and radiative envelopes. Numerical simulatio…
A comparison of the dynamical and model-derived parameters of the pulsating eclipsing binary KIC9850387
S. Sekaran, A. Tkachenko, C. Johnston +1
We aim to unravel the interior mixing profile of the pulsating eclipsing binary KIC9850387 by comparing its dynamical parameters and the parameters derived through a combination of…
Inflight calibration of SRG/ART-XC point spread function at large off-axis angles
R. Krivonos, R. Burenin, E. Filippova +12
The knowledge of the point spread function (PSF) of the Mikhail Pavlinsky Astronomical Roentgen Telescope - X-ray Concentrator (ART-XC) telescope aboard the Spectrum-Roentgen-Gamma…
Signatures of internal rotation discovered in the Kepler data of five slowly pulsating B stars
P. I. Pápics, A. Tkachenko, T. Van Reeth +9
Massive stars are important building blocks of the Universe, and their stellar structure and evolution models are fundamental cornerstones of various fields in modern astrophysics.…
Physical properties of the eclipsing Delta Sct star KIC 10661783
H. Lehmann, J. Southworth, A. Tkachenko +1
KIC 10661783 is an eclipsing binary that shows Delta Sct-like oscillations. More than 60 pulsation frequencies have been detected in its light curve as observed by the Kepler satel…
An extension of the avalanche criterion in the context of c-differentials
P. Ellingsen, C. Riera, P. Stanica +1
The Strict Avalanche Criterion (SAC) is a property of vectorial Boolean functions that is used in the construction of strong S-boxes. We show in this paper how to generalize the co…
Triple system HD 201433 with a SPB star component seen by BRITE-Constellation: Pulsation, differential rotation, and angular momentum transfer
T. Kallinger, W. W. Weiss, P. G. Beck +17
Stellar rotation affects the transport of chemical elements and angular momentum and is therefore a key process during stellar evolution, which is still not fully understood. This…
Least-squares deconvolution based analysis of stellar spectra
T. Van Reeth, A. Tkachenko, V. Tsymbal
In recent years, astronomical photometry has been revolutionised by space missions such as MOST, CoRoT and Kepler. However, despite this progress, high-quality spectroscopy is stil…
Binary Asteroseismic Modelling: isochrone-cloud methodology and application to Kepler gravity-mode pulsators
C. Johnston, A. Tkachenko, C. Aerts +5
The simultaneous presence of variability due to both pulsations and binarity is no rare phenomenon. Unfortunately, the complexities of dealing with even one of these sources of var…
The HERMES Solar Atlas and the spectroscopic analysis of the seismic solar analogue KIC3241581
P. G. Beck, C. Allende Prieto, T. Van Reeth +7
Solar-analog stars provide an excellent opportunity to study the Sun's evolution, i.e. the changes with time in stellar structure, activity, or rotation for solar-like stars. The u…
IGR J16547-1916/1RXS J165443.5-191620 -- a New Intermediate Polar from the INTEGRAL Galactic Survey
A. Lutovinov, R. Burenin, M. Revnivtsev +2
We present the results of our optical identification of the X-ray source IGR J16547-1916 detected by the INTEGRAL observatory during a deep all-sky survey. Analysis of the spectros…
Modelling of the B-type binaries CW Cep and U Oph: A critical view on dynamical masses, core boundary mixing, and core mass
C. Johnston, K. Pavlovski, A. Tkachenko
Context: Intermediate-Mass stars are often overlooked as they are not supernova progenitors but still host convective cores and complex atmospheres which require computationally ex…
Discovery of a magnetic field in the B pulsating system HD 1976
C. Neiner, A. Tkachenko, the MiMeS collaboration
The presence of a magnetic field can have a strong impact on the evolution of a binary star. However, only a dozen of magnetic OB binaries are known as of today and available to st…
Properties of the extremely energetic GRB~221009A from Konus-WIND and SRG/ART-XC observations
D. Frederiks, D. Svinkin, A. L. Lysenko +8
We report on Konus-Wind (KW) and Mikhail Pavlinsky ART-XC telescope observations and analysis of a nearby GRB 221009A, the brightest -ray burst (GRB) detected by KW for 28 y…
The interior rotation of a sample of gamma Doradus stars from ensemble modelling of their gravity mode period spacings
T. Van Reeth, A. Tkachenko, C. Aerts
CONTEXT. Gamma Doradus stars (hereafter gamma Dor stars) are known to exhibit gravity- and/or gravito-intertial modes that probe the inner stellar region near the convective core b…
KIC5950759: a high-amplitude Sct star with amplitude and frequency modulation near the terminal age main sequence
D. M. Bowman, J. Hermans, J. DaszyÅska-Daszkiewicz +5
Amongst the intermediate mass pulsating stars known as Sct stars is a subset of high-amplitude and predominantly radial-mode pulsators known as high-amplitude Sct (HADS)…
The surface brightness - colour relations based on eclipsing binary stars and calibrated with Gaia EDR3
D. Graczyk, G. PietrzyÅski, C. GaÅan +23
The surface brightness -- colour relation (SBCR) is a basic tool in establishing precise and accurate distances within the Local Group. Detached eclipsing binary stars with accurat…
The Araucaria Project: High-precision orbital parallax and masses of eclipsing binaries from infrared interferometry
A. Gallenne, G. PietrzyÅski, D. Graczyk +9
Context. The precise determinations of stellar mass at 1% provide important constraints on stellar evolution models. Accurate parallax measurements can also serve as independ…
Magnetic characterization and variability study of the magnetic SPB star o Lup
B. Buysschaert, C. Neiner, A. J. Martin +5
Thanks to large dedicated surveys, large-scale magnetic fields have been detected for about 10% of early-type stars. We aim to precisely characterize the large-scale magnetic field…
Spectral analysis of Kepler SPB and Beta Cep candidate stars
H. Lehmann, A. Tkachenko, T. Semaan +6
We determine the fundamental parameters of SPB and Beta Cep candidate stars observed by the Kepler satellite mission and estimate the expected types of non-radial pulsators by comp…
The ART-XC telescope on board the SRG observatory
M. Pavlinsky, A. Tkachenko, V. Levin +59
ART-XC (Astronomical Roentgen Telescope - X-ray Concentrator) is the hard X-ray instrument with grazing incidence imaging optics on board the Spektr-Roentgen-Gamma (SRG) observator…
On the sensitivity of gravito-inertial modes to differential rotation in intermediate-mass main-sequence stars
T. Van Reeth, J. S. G. Mombarg, S. Mathis +9
Context. While rotation has a major impact on stellar structure and evolution, its effects are not well understood. Thanks to high- quality and long timebase photometric observatio…
The eccentric massive binary V380 Cyg: revised orbital elements and interpretation of the intrinsic variability of the primary component
A. Tkachenko, P. Degroote, C. Aerts +8
We present a detailed analysis and interpretation of the high-mass binary V380 Cyg, based on high-precision space photometry gathered with the Kepler space mission as well as high-…
Gravity-mode period spacings as seismic diagnostic for a sample of gamma Doradus stars from Kepler space photometry and high-resolution ground-based spectroscopy
T. Van Reeth, A. Tkachenko, C. Aerts +20
Gamma Doradus stars (hereafter gamma Dor stars) are gravity-mode pulsators of spectral type A or F. Such modes probe the deep stellar interior, offering a detailed fingerprint of t…
Observational mapping of the mass discrepancy in eclipsing binaries: Selection of the sample and its photometric and spectroscopic properties
A. Tkachenko, K. Pavlovski, N. Serebriakova +4
Abridged. Eclipsing spectroscopic double-lined binaries are the prime source of precise and accurate measurements of masses and radii of stars. These measurements provide a stringe…
The mass discrepancy in intermediate- and high-mass eclipsing binaries: the need for higher convective core masses
A. Tkachenko, K. Pavlovski, C. Johnston +6
(Abridged) Eclipsing, spectroscopic double-lined binary star systems (SB2) are excellent laboratories for calibrating theories of stellar interior structure and evolution. We aim t…
Lithium abundance and rotation of seismic solar analogues - Solar and stellar connection from Kepler and Hermes observations
P. G. Beck, J. -D. do Nascimento, T. Duarte +13
Lithium abundance A(Li) and surface rotation are good diagnostic tools to probe the internal mixing and angular momentum transfer in stars. We explore the relation between surface…
Calibration of the ART-XC mirror modules at MSFC
R. Krivonos, A. Tkachenko, R. Burenin +12
The Astronomical Roentgen Telescope X-ray Concentrator (ART-XC) is a hard X-ray telescope with energy response up to 30 keV, to be launched on board the Spectrum Roentgen Gamma (SR…
Sample of Cataclysmic Variables from 400d X-ray Survey
R. Burenin, M. Revnivtsev, A. Tkachenko +6
We present a sample of eight cataclysmic variables (CVs) identified among the X-ray sources of the 400 square degree (400d) X-ray ROSAT/PSPC survey. Based on this sample, we have o…
KIC 10080943: An eccentric binary system containing two pressure- and gravity-mode hybrid pulsators
V. S. Schmid, A. Tkachenko, C. Aerts +14
Gamma Doradus and delta Scuti pulsators cover the transition region between low mass and massive main-sequence stars, and as such, are critical for testing stellar models. When the…
The PLATO 2.0 Mission
H. Rauer, C. Catala, C. Aerts +159
PLATO 2.0 has recently been selected for ESA's M3 launch opportunity (2022/24). Providing accurate key planet parameters (radius, mass, density and age) in statistical numbers, it…
HD 34736: An intensely magnetised double-lined spectroscopic binary with rapidly-rotating chemically peculiar B-type components
E. Semenko, O. Kochukhov, Z. Mikulášek +21
We report the results of a comprehensive study of the spectroscopic binary (SB2) system HD 34736 hosting two chemically peculiar (CP) late B-type stars. Using new and archival obse…
V446 Cephei: a Cep pulsator in a multiple system
A. Moharana, J. Southworth, K. Pavlovski +7
Cep stars in eclipsing binary (EB) systems give us an opportunity to put observational constraints on their structure and stellar parameters. We present a comprehensive analys…
Rotation and pulsation in Ap stars: first light results from TESS sectors 1 and 2
M. S. Cunha, V. Antoci, D. L. Holdsworth +36
We present the first results from the Transiting Exoplanet Survey Satellite (TESS) on the rotational and pulsational variability of magnetic chemically peculiar A-type stars. We an…
Cosmic ray Nickel nuclei spectrum by the NUCLEON experiment
V. Grebenyuk, D. Karmanov, I. Kovalev +9
The NUCLEON experiment is designed to measure chemical composition of cosmic rays with charges from Z=1 to 30 in an energy region from 5*10^11 to 10^15 eV. In this article the data…
First results of the cosmic ray NUCLEON experiment
E. Atkin, V. Bulatov, V. Dorokhov +19
The NUCLEON experiment was designed to study the chemical composition and energy spectra of galactic cosmic ray nuclei from protons to zinc at energies of --\…
Seismic probing of the first dredge-up event through the eccentric red-giant & red-giant spectroscopic binary KIC9163796
P. G. Beck, T. Kallinger, K. Pavlovski +10
Binaries in double-lined spectroscopic systems provide a homogeneous set of stars. Differences of parameters, such as age or initial conditions, which otherwise would have strong i…
An M dwarf Companion to an F-type Star in a young main-sequence binary
Ph. Eigmüller, J. Eislöffel, Sz. Csizmadia +9
Only a few well characterized very low-mass M dwarfs are known today. Our understanding of M dwarfs is vital as these are the most common stars in our solar neighborhood. We aim to…
The Kepler characterization of the variability among A- and F-type stars. I. General overview
K. Uytterhoeven, A. Moya, A. Grigahcene +38
The Kepler spacecraft is providing time series of photometric data with micromagnitude precision for hundreds of A-F type stars. We present a first general characterization of the…
SRG/ART-XC Galactic Bulge deep survey. I. Maximum likelihood source detection algorithm for X-ray surveys
A. Semena, A. Vikhlinin, I. Mereminskiy +4
We describe an X-ray source detection method entirely based on the maximum likelihood analysis, in application to observations with the ART-XC telescope onboard the Spectrum Roentg…
Discovery of binarity, spectroscopic frequency analysis, and mode identification of the delta Sct star 4CVn
V. S. Schmid, N. ThemeÃl, M. Breger +12
More than 40 years of ground-based photometric observations of the delta Sct star 4CVn revealed 18 independent oscillation frequencies, including radial as well as non-radial p-mod…
Discovery of Cep pulsations in the eclipsing binary V453 Cygni
J. Southworth, D. M. Bowman, A. Tkachenko +1
V453 Cyg is an eclipsing binary containing 14 Msun and 11 Msun stars in an eccentric short-period orbit. We have discovered Cep-type pulsations in this system using TESS data.…
The first view of Scuti and Doradus stars with the TESS mission
V. Antoci, M. S. Cunha, D. M. Bowman +63
We present the first asteroseismic results for Scuti and Doradus stars observed in Sectors 1 and 2 of the TESS mission. We utilise the 2-min cadence TESS data for a sampl…
Observations of the Soft Gamma-Ray early Afterglow emission from Two Bright Gamma-ray Bursts
A. Tkachenko, O. Terekhov, R. Sunyaev +4
We present the results of observations of the soft gamma-ray early afterglows with the energy above 100keV from two bright Gamma-ray bursts detected by the PHEBUS instrument of the…
MELCHIORS: The Mercator Library of High Resolution Stellar Spectroscopy
P. Royer, T. Merle, K. Dsilva +71
Over the past decades, libraries of stellar spectra have been used in a large variety of science cases, including as sources of reference spectra for a given object or a given spec…