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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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253 papers · 1 filter
Spectroscopy of flares on AU Mic
P. Odert, M. Leitzinger, P. Kabáth +6
Photometric space missions like Kepler and TESS have revealed unprecedented statistics of stellar flares, including the frequent detection of highly energetic superflares. Spectros…
Spectroscopic investigation of the southern late-K/early-M dwarf binary CC Eri
M. Leitzinger, P. Odert, R. Greimel +6
In the recent past investigations of stellar Coronal Mass Ejections (CMEs) and flares/superflares gained special attention because of their relevance for planetary habitability and…
The Be star omicron Cas is indeed the primary of a triple system
Petr Harmanec, Stephenson Yang, Miroslav Slechta +3
Analysis of radial velocities of two narrow absorption components in the Mg II 4481 A line demonstrated that the secondary of the Be star omicron Cas is indeed a close binary syste…
Intermediate-Mass Mergers: A New Scenario for Several FS CMa Stars
Daniela Korcakova, Nela Dvorakova, Iris Bermejo Lozano +6
We summarise the properties and nature of a peculiar group of B-type stars called FS CMa stars. These stars show the B[e] phenomenon, i.e., their spectra exhibit both forbidden emi…
Dynamical mass of a solar-like oscillator at the main-sequence turnoff from Gaia astrometry & ground-based spectroscopy
P. G. Beck, T. Masseron, K. Pavlovski +11
Asteroseismology is widely used for precise determining of masses of solar-like oscillating stars by performing individual-frequency modeling or applying homological scaling relati…
A rotation-based census of blue lurker candidates in open clusters
Vikrant V. Jadhav, Khushboo K. Rao, Elisabetta Reggiani
Blue lurkers (BLs) are rejuvenated main-sequence stars hidden among normal main-sequence stars on color-magnitude diagrams of star clusters. In comparison, the blue straggler stars…
Gaia20fnr: A binary-lens microlensing event with full orbital motion revealed by four space telescopes
M. Wicker, Ł. Wyrzykowski, M. Hundertmark +49
The microlensing event Gaia20fnr is a long-duration, non-caustic-crossing binary-lens event at high Galactic latitude. Triggered by a photometric rise detected by the Gaia space mi…
High Resolution Overtone Spectroscopy of HNC and HCN
Miguel Jiménez-Redondo, Chiara Schleif, Julianna Palotás +5
Rotationally resolved spectra of the HNC and HCN molecular ions have been recorded in the spectral range between 6200 and 6800 \rcm\ using a cryogenic ion trap instrument.…
Three new 2+2 quadruple systems with changing inclination
P. Zasche, Z. Henzl, M. Mašek +4
We present a unique discovery of three new detected systems showing two different phenomena together. These are 2+2 quadruple stellar systems showing two eclipsing binaries as the…
Symbiotic stars in the era of modern ground- and space-based surveys
Jaroslav Merc
Symbiotic stars, interacting binaries composed of a cool giant and a hot compact companion, exhibit complex variability across the electromagnetic spectrum. Over the past decades,…
Spectroscopic observations of flares and superflares on AU Mic
P. Odert, M. Leitzinger, R. Greimel +13
The young active flare star AU~Mic is the planet host star with the highest flare rate from TESS data. Therefore, it represents an ideal target for dedicated ground-based monitorin…
Journey to the center of the common envelope evolution. Inner dynamics of the post-dynamical inspiral
Damien Gagnier, Ondrej Pejcha
Three-dimensional hydrodynamical simulations of common envelope evolution are often terminated soon after the initial dynamical plunge of the companion transitions into a long-last…
Flare heating of the chromosphere: Observations of flare continuum from GREGOR and IRIS
M. García-Rivas, J. Kašparová, A. Berlicki +8
Context: On 2022 May 4, an M5.7 flare erupted in the active region NOAA 13004, which was the target of a coordinated campaign between GREGOR, IRIS, Hinode, and ground-based instrum…
Five new eclipsing binaries with low-mass companions
J. Lipták, M. Skarka, E. Guenther +18
Precise space-based photometry from the Transiting Exoplanet Survey Satellite results in a huge number of exoplanetary candidates. However, the masses of these objects are unknown…
Eight new 2+2 doubly eclipsing quadruple systems detected
P. Zasche, Z. Henzl, J. Merc +2
We studied eight new doubly eclipsing stellar systems. We found that they are all rare examples of quadruple systems of 2 + 2 architecture, where both inner pairs are eclipsing bin…
Onset of penumbra formation
M. García-Rivas, J. Jurčák, N. Bello González +3
Context. Fully fledged penumbrae have been widely studied both observationally and theoretically. Yet the relatively fast process of penumbra formation has not been studied closely…
Six new eccentric eclipsing systems with a third body
P. Zasche, Z. Henzl, M. Wolf
We present the discovery of six new triple stellar system candidates composed of an inner eccentric-orbit eclipsing binary with an apsidal motion. These stars were studied using ne…
Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco
Jaroslav Merc, Peter Velez, Stéphane Charbonnel +5
The poorly studied variable star V390 Sco, previously classified as a Mira pulsator, was detected in a brightening event by the ESA Gaia satellite in September 2023. This work pres…
2.5-MHD models of circumstellar discs around FS~CMa post-mergers : II. Stationary accretion stage
A. Moranchel-Basurto, D. Korčáková, R. O. Chametla
We study the star-disc interaction in the presence of the strong magnetic field () of a slowly rotating star. This situation describes a post-merger of the spectral…
M31N 2013-10c: A Newly Identified Recurrent Nova in M31
Allen W. Shafter, Kamil Hornoch, Hana Kučáková +11
The nova M31N 2023-11f (2023yoa) has been recently identified as the second eruption of a previously recognized nova, M31N 2013-10c, establishing the latter object as the 21st recu…
Relation between magnetic field inclination and apparent motion of penumbral grains
Michal Sobotka, Jan Jurčák, J. Sebastián Castellanos Durán +1
Context. Bright heads of penumbral filaments, penumbral grains (PGs), show apparent horizontal motions inwards, towards the umbra, or outwards, away from the umbra. Aims. We aim to…
Improved period variations of 32 contact binaries with rapidly decreasing periods in the Galactic Bulge
Kyeongsoo Hong, Jae Woo Lee, Dong-Jin Kim +4
We present detailed analyses of updated eclipse timing diagrams for 32 contact binary merger candidates in the Galactic bulge. The photometric data was obtained from 2016 to 2021 u…
Post-dynamical inspiral phase of common envelope evolution. The role of magnetic fields
Damien Gagnier, Ondrej Pejcha
During common envelope evolution, an initially weak magnetic field may undergo amplification by interacting with spiral density waves and turbulence generated in the stellar envelo…
The convective kissing instability in low-mass M-dwarf models: convective overshooting, semi-convection, luminosity functions, surface abundances and star cluster age dating
Santana Mansfield, Pavel Kroupa
Low-mass models of M-dwarfs that undergo the convective kissing instability fluctuate in luminosity and temperature resulting in a gap in the main sequence that is observed in the…