Publications (105)
An asteroseismic study of the O9V star HD 46202 from CoRoT space-based photometry
M. Briquet, C. Aerts, A. Baglin +13
The O9V star HD 46202, which is a member of the young open cluster NGC 2244, was observed by the CoRoT satellite in October/November 2008 during a short run of 34 days. From the ve…
Abundance analysis of targets for the COROT / MONS asteroseimology missions I. Semi-automatic abundance analysis of the gamma Dor star HD 49434
H. Bruntt, C. Catala, R. Garrido +7
One of the goals of the ground-based support program for the COROT and MONS/Roemer satellite missions is to select and characterise suitable target stars for the part of the missio…
Modelling a high-mass red giant observed by CoRoT
F. Baudin, C. Barban, M. J. Goupil +15
The G6 giant HR\,2582 (HD\,50890) was observed by CoRoT for approximately 55 days. Mode frequencies are extracted from the observed Fourier spectrum of the light curve. Numerical s…
CoRoT observations of O stars: diverse origins of variability
R. Blomme, M. Briquet, P. Degroote +26
Six O-type stars were observed continuously by the CoRoT satellite during a 34.3-day run. The unprecedented quality of the data allows us to detect even low-amplitude stellar pulsa…
Seismic and spectroscopic characterization of the solar-like pulsating CoRoT target HD 49385
S. Deheuvels, H. Bruntt, E. Michel +16
The star HD 49385 is the first G-type solar-like pulsator observed in the seismology field of the space telescope CoRoT. The satellite collected 137 days of high-precision photomet…
Characterisation of the magnetic field of the Herbig Be star HD 200775
E. Alecian, C. Catala, G. A. Wade +9
After our recent discovery of four magnetic Herbig stars, we have decided to study in detail one of them, HD 200775, to determine if its magnetic topology is similar to that of the…
CoRoT high-precision photometry of the B0.5 IV star HD 51756
P. I. Pápics, M. Briquet, M. Auvergne +13
OB stars are important constituents for the ecology of the Universe, and there are only a few studies on their pulsational properties detailed enough to provide important feedback…
The tip of the iceberg: the frequency content of the Delta Sct star HD 50844 from CoRoT space photometry
E. Poretti, L. Mantegazza, M. Rainer +19
It has been suggested that the detection of a wealth of very low amplitude modes in Delta Sct stars was only a matter of signal--to--noise ratio. Access to this treasure, impossibl…
Investigation of the magnetic field characteristics of Herbig Ae/Be stars: Discovery of the pre-main sequence progenitors of the magnetic Ap/Bp stars
G. A. Wade, D. Drouin, S. Bagnulo +10
We are investigating the magnetic characteristics of pre-main sequence Herbig Ae/Be stars, with the aim of (1) understanding the origin and evolution of magnetism in intermediate-m…
CoRoT's view on variable B8/9 stars: spots versus pulsations: Evidence for differential rotation in HD 174648
P. Degroote, B. Acke, R. Samadi +11
Context. There exist few variability studies of stars in the region in the Hertzsprung-Russell diagram between the A and B-star pulsational instability strips. With the aid of the…
Pulsations in the late-type Be star HD 50209 detected by CoRoT
P. D. Diago, J. Gutierrez-Soto, M. Auvergne +22
The presence of pulsations in late-type Be stars is still a matter of controversy. It constitutes an important issue to establish the relationship between non-radial pulsations and…
Magnetic cycles of the planet-hosting star Tau Bootis: II. a second magnetic polarity reversal
R. Fares, J. -F. Donati, C. Moutou +7
In this paper, we present new spectropolarimetric observations of the planet-hosting star Tau Bootis, using ESPaDOnS and Narval spectropolarimeters at Canada-France-Hawaii Telescop…
Toroidal versus poloidal magnetic fields in Sun-like stars: a rotation threshold
P. Petit, B. Dintrans, S. K. Solanki +8
From a set of stellar spectropolarimetric observations, we report the detection of surface magnetic fields in a sample of four solar-type stars, namely HD 73350, HD 76151, HD 14623…
The seismology programme of CoRoT
E. Michel, A. Baglin, M. Auvergne +1
We introduce the main lines and specificities of the CoRoT Seismology Core Programme. The development and consolidation of this programme has been made in the framework of the CoRo…
A high-resolution spectropolarimetric survey of Herbig Ae/Be stars - II. Rotation
E. Alecian, G. A. Wade, C. Catala +5
We report the analysis of the rotational properties of our sample of Herbig Ae/Be (HAeBe) and related stars for which we have obtained high-resolution spectropolarimetric observati…
Accurate parameters of 93 solar-type Kepler targets
H. Bruntt, S. Basu, B. Smalley +29
We present a detailed spectroscopic study of 93 solar-type stars that are targets of the NASA/Kepler mission and provide detailed chemical composition of each target. We find that…
Non-radial oscillations in the red giant HR7349 measured by CoRoT
F. Carrier, J. De Ridder, F. Baudin +13
Convection in red giant stars excites resonant acoustic waves whose frequencies depend on the sound speed inside the star, which in turn depends on the properties of the stellar in…
The asteroseismic ground-based observational counterpart of CoRoT
K. Uytterhoeven, E. Poretti, P. Mathias +13
We present different aspects of the ground-based observational counterpart of the CoRoT satellite mission. We give an overview of the selected asteroseismic targets, the numerous i…
The magnetic field of the B3V star 16 Pegasi
H. F. Henrichs, C. Neiner, R. S. Schnerr +8
The Slowly Pulsating B3V star 16 Pegasi was discovered by Hubrig (2006) to be magnetic, based on low-resolution spectropolarimetric observations with FORS1 at the VLT. We have conf…
Variability in the CoRoT photometry of three hot O-type stars. HD 46223, HD 46150 and HD 46966
R. Blomme, L. Mahy, C. Catala +15
The detection of pulsational frequencies in stellar photometry is required as input for asteroseismological modelling. The second short run (SRa02) of the CoRoT mission has provide…
Solar-like oscillations in a massive star
K. Belkacem, R. Samadi, M. -J. Goupil +15
Seismology of stars provides insight into the physical mechanisms taking place in their interior, with modes of oscillation probing different layers. Low-amplitude acoustic oscilla…
Mixed modes in red-giant stars observed with CoRoT
B. Mosser, C. Barban, J. Montalban +15
The CoRoT mission has provided thousands of red-giant light curves. The analysis of their solar-like oscillations allows us to characterize their stellar properties. Up to now, the…
Solar-like oscillations with low amplitude in the CoRoT target HD 181906
R. A. Garcia, C. Regulo, R. Samadi +23
Context: The F8 star HD 181906 (effective temperature ~6300K) was observed for 156 days by the CoRoT satellite during the first long run in the centre direction. Analysis of the da…
The magnetic field of the pre-main sequence Herbig Ae star HD 190073
C. Catala, E. Alecian, J. -F. Donati +7
The general context of this paper is the study of magnetic fields in the pre-main sequence intermediate mass Herbig Ae/Be stars. Magnetic fields are likely to play an important rol…
Preparing the COROT space mission: new variable stars in the galactic Anticenter direction
E. Poretti, R. Alonso, P. J. Amado +15
The activities related to the preparation of the asteroseismic, photometric space mission COROT are described. Photoelectric observations, wide--field CCD photometry, uvbyB calibra…
A Bcool magnetic snapshot survey of solar-type stars
S. C. Marsden, P. Petit, S. V. Jeffers +20
Stellar magnetic field measurements obtained from spectropolarimetry offer key data for activity and dynamo studies, and we present the results of a major high-resolution spectropo…
The universal red-giant oscillation pattern; an automated determination with CoRoT data
B. Mosser, K. Belkacem, M. J. Goupil +12
The CoRoT and Kepler satellites have provided thousands of red-giant oscillation spectra. The analysis of these spectra requires efficient methods for identifying all eigenmode par…
The PLATO Simulator: modelling of high-precision high-cadence space-based imaging
P. Marcos-Arenal, W. Zima, J. De Ridder +8
Many aspects of the design trade-off of a space-based instrument and its performance can best be tackled through simulations of the expected observations. The complex interplay of…
Transiting exoplanets from the CoRoT space mission VIII. CoRoT-7b: the first Super-Earth with measured radius
A. Leger, D. Rouan, J. Schneider +51
We report the discovery of very shallow (DF/F = 3.4 10-4), periodic dips in the light curve of an active V = 11.7 G9V star observed by the CoRoT satellite, which we interpret as du…
Discovery of a weak magnetic field in the photosphere of the single giant Pollux
M. Auriere, G. A. Wade, R. Konstantinova-Antova +11
Aims: We observe the nearby, weakly-active single giant, Pollux, in order to directly study and infer the nature of its magnetic field. Methods: We used the new generation spectrop…
CoRoT\,102699796, the first metal-poor Herbig Ae pulsator: a hybrid Sct- Dor variable?
V. Ripepi, F. Cusano, M. Di Criscienzo +7
We present the analysis of the time series observations of CoRoT\,102699796 obtained by the CoRoT satellite that show the presence of five independent oscillation frequencies in th…
A fresh look at the seismic spectrum of HD49933: analysis of 180 days of CoRoT photometry
O. Benomar, F. Baudin, T. L. Campante +18
Solar-like oscillations have now been observed in several stars, thanks to ground-based spectroscopic observations and space-borne photometry. CoRoT, which has been in orbit since…
Spectropolarimetric observations of the transiting planetary system of the K dwarf HD 189733
C. Moutou, J. -F. Donati, R. Savalle +7
With a Jupiter-mass planet orbiting at a distance of only 0.031 AU, the active K2 dwarf HD 189733 is a potential candidate in which to study the magnetospheric interactions of a co…
Characterisation of the magnetic fields of the Herbig Be stars HD 200775 and V380 0ri
E. Alecian, G. A. Wade, C. Catala +7
The origin of the magnetic fields of the chemically peculiar main sequence Ap/Bp stars is still matter of intense debate. The recent discoveries of magnetic fields in Herbig Ae/Be…
Low-amplitude rotational modulation rather than pulsations in the CoRoT B-type supergiant HD 46769
C. Aerts, S. Simon-Diaz, C. Catala +16
{We aim to detect and interpret photometric and spectroscopic variability of the bright CoRoT B-type supergiant target HD\,46769 (). We also attempt to detect a magnetic fi…
Seismic analysis of HD43587Aa, a solar-like oscillator in a multiple system
P. Boumier, O. Benomar, F. Baudin +26
Context. The object HD 43587Aa is a G0V star observed during the 145-day LRa03 run of the COnvection, ROtation and planetary Transits space mission (CoRoT), for which complementary…
Asteroseismic analysis of the CoRoT target HD 169392
S. Mathur, H. Bruntt, C. Catala +25
The satellite CoRoT (Convection, Rotation, and planetary Transits) has provided high-quality data for almost six years. We show here the asteroseismic analysis and modeling of HD16…
GAUDI: a preparatory archive for the COROT mission
E. Solano, C. Catala, R. Garrido +34
The GAUDI database (Ground-based Asteroseismology Uniform Database Interface, http://sdc.laeff.esa.es/gaudi/) is a preparatory archive for the COROT (COnvection, ROtation and plane…
The PLATO End-to-End CCD Simulator -- Modelling space-based ultra-high precision CCD photometry for the assessment study of the PLATO Mission
W. Zima, T. Arentoft, J. De Ridder +4
The PLATO satellite mission project is a next generation ESA Cosmic Vision satellite project dedicated to the detection of exo-planets and to asteroseismology of their host-stars u…
Asymptotic and measured large frequency separations
B. Mosser, E. Michel, K. Belkacem +7
With the space-borne missions CoRoT and Kepler, a large amount of asteroseismic data is now available. So-called global oscillation parameters are inferred to characterize the larg…
Gravito-inertial and pressure modes detected in the B3 IV CoRoT target HD 43317
P. I. Pápics, M. Briquet, A. Baglin +14
Context. OB stars are important building blocks of the Universe, but we have only a limited sample of them well understood enough from an asteroseismological point of view to provi…
Periodic mass loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD50064
C. Aerts, K. Lefever, A. Baglin +15
We aim to interpret the photometric and spectroscopic variability of the luminous blue variable supergiant HD\,50064 ().CoRoT space photometry and follow-up high-resolution…
The pre-main sequence star HD 34282: A very short period delta Scuti-type pulsator
P. J. Amado, A. Moya, J. C. Suarez +5
HD 34282 has been found to pulsate during a systematic search for short-term photometric variability in Herbig Ae/Be stars with the goal of determining the position and size of the…
The stellar wind cycles and planetary radio emission of the Tau Boo system
A. A. Vidotto, R. Fares, M. Jardine +5
Tau Boo is an intriguing planet-host star that is believed to undergo magnetic cycles similar to the Sun, but with a duration that is about one order of magnitude smaller than that…
CoRoT measures solar-like oscillations and granulation in stars hotter than the Sun
E. Michel, A. Baglin, M. Auvergne +2
Oscillations of the Sun have been used to understand its interior structure. The extension of similar studies to more distant stars has raised many difficulties despite the strong…
PIMMS: Pulsation-Informed Magnetic Mapping of Stars with Zeeman-Doppler Imaging I. Formalism and numerical tests
C. Gutteridge, C. Neiner, C. Catala +1
Context. Magneto-asteroseismology is a novel technique allowing for more precise determinations of internal properties of magnetic pulsating stars, but requires an accurate charact…
The variability of the CoRoT target HD171834: gamma Dor pulsations and/or activity?
K. Uytterhoeven, P. Mathias, A. Baglin +15
We present the preliminary results of a frequency and line-profile analysis of the CoRoT gamma Dor candidate HD171834. The data consist of 149 days of CoRoT light curves and a grou…
Mass-loss induced instabilities in fast rotating stars
F. Lignieres, C. Catala, A. Mangeney
To explain the origin of Herbig Ae/Be stars activity, it has been recently proposed that strong mass-losses trigger rotational instabilities in the envelope of fast rotating stars.…
Magnetism of Herbig Ae/Be stars
G. A. Wade, E. Alecian, J. Grunhut +4
Observations of magnetic fields of stars at the pre-main sequence phase can provide important new insights into the complex physics of the late stages of star formation. This is es…
Magnetic fields in Herbig Ae/Be stars
G. A. Wade, C. Catala, E. Alecian +7
Studies of stellar magnetism at the pre-main sequence phase can provide important new insights into the detailed physics of the late stages of star formation, and into the observed…
Investigating the pre-main sequence magnetic chemically peculiar system HD 72106
C. P. Folsom, G. A. Wade, D. A. Hanes +7
The origin of the strong magnetic fields observed in chemically peculiar Ap and Bp stars stars has long been debated. The recent discovery of magnetic fields in the intermediate ma…
Magnetic, Chemical and Rotational Properties of the Herbig Ae/Be Binary System HD 72106
C. P. Folsom, G. A. Wade, O. Kochukhov +5
Recently, strong, globally-ordered magnetic fields have been detected in some Herbig Ae and Be (HAeBe) stars, suggesting a possible evolutionary connection to main sequence magneti…
Asteroseismic analysis of the CoRoT δ-Scuti star HD174936
A. GarcÃa Hernández, A. Moya, E. Michel +13
We present an analysis of the δ-Scuti star object HD 174936 (ID 7613) observed by CoRoT during the first short run SRc01 (27 days). A total number of 422 frequencies we are extrac…
Magnetospheric accretion on the T Tauri star BP Tauri
J. F. Donati, M. M. Jardine, S. G. Gregory +15
From observations collected with the ESPaDOnS and NARVAL spectropolarimeters, we report the detection of Zeeman signatures on the classical T Tauri star BP Tau. Circular polarisati…
Discovery of the pre-main sequence progenitors of the magnetic Ap/Bp stars?
G. A. Wade, D. Drouin, S. Bagnulo +8
We report the discovery, using FORS1 at the ESO-VLT and ESPaDOnS at the CFHT, of magnetic fields in the young A-type stars HD 101412, V380 Ori and HD 72106A. Two of these stars (HD…
A high-resolution spectropolarimetric survey of Herbig Ae/Be stars - I. Observations and measurements
E. Alecian, G. A. Wade, C. Catala +7
This is the first in a series of papers in which we describe and report the analysis of a large survey of Herbig Ae/Be stars in circular spectropolarimetry. Using the ESPaDOnS and…
Asteroseismology and Interferometry
M. S. Cunha, C. Aerts, J. Christensen-Dalsgaard +22
Asteroseismology provides us with a unique opportunity to improve our understanding of stellar structure and evolution. Recent developments, including the first systematic studies…
HD 174884: a strongly eccentric, short-period early-type binary system discovered by CoRoT
C. Maceroni, J. Montalban, E. Michel +12
Accurate photometric CoRoT space observations of a secondary seismological target, HD 174884, led to the discovery that this star is an astrophysically important double-lined eclip…
Discovery of non-radial pulsations in the spectroscopic binary Herbig Ae star RS Cha
T. Böhm, W. Zima, C. Catala +3
In this article we present a first discovery of non radial pulsations in both components of the Herbig Ae spectroscopic binary star RS Cha. The binary was monitored in quasi-contin…
Abundance analysis of targets for the COROT / MONS asteroseismology missions II. Abundance analysis of the COROT main targets
H. Bruntt, I. F. Bikmaev, C. Catala +13
One of the goals of the ground-based support program for the COROT and Roemer satellite missions is to characterize suitable target stars for the part of the missions dedicated to…
Surface structure of the CoRoT CP2 target star HD 50773
T. Lüftinger, H. -E. Fröhlich, W. Weiss +15
We compare surface maps of the chemically peculiar star HD 50773 produced with a Bayesian technique and based on high quality CoRoT photometry with those derived from rotation phas…
Calibration of the pre-main sequence RS Cha binary system
E. Alecian, M. -J. Goupil, Y. Lebreton +2
Context: The calibration of binary systems with accurately known masses and/or radii provides powerful tools to test stellar structure and evolution theory and to determine the age…
Searching for Star-Planet interactions within the magnetosphere of HD 189733
R. Fares, J. -F. Donati, C. Moutou +7
HD 189733 is a K2 dwarf, orbited by a giant planet at 8.8 stellar radii. In order to study magnetospheric interactions between the star and the planet, we explore the large-scale m…
Blue Dots Team Transits Working Group Review
A. Sozzetti, C. Afonso, R. Alonso +9
Transiting planet systems offer an unique opportunity to observationally constrain proposed models of the interiors (radius, composition) and atmospheres (chemistry, dynamics) of e…
An in-depth study of HD 174966 with CoRoT photometry and HARPS spectroscopy. Large separation as a new observable for δSct stars
A. GarcÃa Hernández, A. Moya, E. Michel +18
The aim of this work was to use a multi-approach technique to derive the most accurate values possible of the physical parameters of the δSct star HD174966. In addition, we search…
Impact of the new solar abundances on the calibration of the PMS binary system RS Cha
E. Alecian, Y. Lebreton, M-J. Goupil +2
Context: In a recent work, we tried to obtain a calibration of the two components of the pre-main sequence binary system RS Cha by means of theoretical stellar models. We found tha…
The magnetic field of the planet-hosting star Bootis
C. Catala, J. -F. Donati, E. Shkolnik +2
We have obtained high resolution spectropolarimetric data for the planet-hosting star Bootis, using the ESPaDOnS spectropolarimeter at CFHT. A weak but clear Stokes signat…
HD 50844: the new look of Delta Sct stars from CoRoT space photometry
E. Poretti, E. Michel, R. Garrido +21
It has also been suggested that the detection of a wealth of very low amplitude modes in Delta Sct stars was only a matter of signal--to--noise ratio. Access to this treasure, impo…
Multi-Site observations of SU Aurigae
Y. C. Unruh, J. -F. Donati, J. M. Oliveira +20
We present results from the 1996 MUSICOS (MUlti-SIte COntinuous Spectroscopy) campaign on the T Tauri star SU Aurigae. We find a 2.7-d periodicity in the He I (587.6 nm) line and s…
HD 51106 and HD 50747: an ellipsoidal binary and a triple system observed with CoRoT
N. Dolez, S. Vauclair, E. Michel +13
We present an analysis of the observations of HD 51106 and HD 50747 by the satellite CoRoT, obtained during its initial run, and of the spectroscopic preparatory observations. AIMS…
The dramatic change of the fossil magnetic field of HD 190073: evidence of the birth of the convective core in a Herbig star ?
E. Alecian, C. Neiner, S. Mathis +4
In the context of the ESPaDOnS and Narval spectropolarimetric surveys of Herbig Ae/Be stars, we discovered and then monitored the magnetic field of HD 190073 over more than four ye…
The solar-like CoRoT target HD 170987: spectroscopic and seismic observations
S. Mathur, R. A. Garcia, C. Catala +22
The CoRoT mission is in its third year of observation and the data from the second long run in the galactic centre direction are being analysed. The solar-like oscillating stars th…
Search for the magnetic field of the O7.5 III star xi Persei
H. F. Henrichs, R. S. Schnerr, J. A. de Jong +3
Cyclical wind variability is an ubiquitous but as yet unexplained feature among OB stars. The O7.5 III(n)((f)) star xi Persei is the brightest representative of this class on the N…
Predicted asteroseismic detection yield for solar-like oscillating stars with PLATO
M. J. Goupil, C. Catala, R. Samadi +26
We determine the expected yield of detections of solar-like oscillations for the PLATO ESA mission. We used a formulation from the literature to calculate the probability of detect…
Constraining magnetic-activity modulations in 3~solar-like stars observed by CoRoT and NARVAL
S. Mathur, R. A. Garcia, A. Morgenthaler +5
Stellar activity cycles are the manifestation of dynamo process running in the stellar interiors. They have been observed during years to decades thanks to the measurement of stell…
Magnetism in Herbig Ae/Be stars and the link to the Ap/Bp stars
E. Alecian, C. Catala, G. A. Wade +11
Among the A/B stars, about 5% host large-scale organised magnetic fields. These magnetic stars show also abundance anomalies in their spectra, and are therefore called the magnetic…
Magnetic cycles of the planet-hosting star tauBootis
J. F. Donati, C. Moutou, R. Fares +7
We have obtained new spectropolarimetric observations of the planet-hosting star tauBootis, using the ESPaDOnS and NARVAL spectropolarimeters at the Canada-France-Hawaii Telescope…
Magnetism and binarity of the Herbig Ae star V380 Ori
E. Alecian, G. A. Wade, C. Catala +7
In this paper we report the results of high-resolution circular spectropolarimetric monitoring of the Herbig Ae star V380 Ori, in which we discovered a magnetic field in 2005. A ca…
Discovery of magnetic fields in the very young, massive stars W601 (NGC 6611) and OI 201 (NGC 2244)
E. Alecian, G. A. Wade, C. Catala +8
Context: Recent spectropolarimetric observations of Herbig Ae/Be stars have yielded new arguments in favour of a fossil origin for the magnetic fields of intermediate mass stars. A…
Preparing the COROT space mission: incidence and characterisation of pulsation in the Lower Instability Strip
E. Poretti, R. Garrido, P. J. Amado +24
By pursuing the goal to find new variables in the COROT field-of-view we characterised a sample of stars located in the lower part of the instability strip. Our sample is composed…
To PLAnetary Transit Or NOT? An extremely large field of view camera with a CaF2 component tested in thermo-vacuum
M. Bergomi, D. Magrin, J. Farinato +13
Because of its nicely chromatic behavior, Calcium Fluoride (CaF2) is a nice choice for an optical designer as it can easily solve a number of issues, giving the right extra degree…
HD 51844: An Am delta Scuti in a binary showing periastron brightening
M. Hareter, M. Paparó, W. W. Weiss +12
Pulsating stars in binary systems are ideal laboratories to test stellar evolution and pulsation theory, since a direct, model-independent determination of component masses is poss…
Detection of frequency spacings in the young O-type binary HD 46149 from CoRoT photometry
P. Degroote, M. Briquet, M. Auvergne +15
Using the CoRoT space based photometry of the O-type binary HD46149, stellar atmospheric effects related to rotation can be separated from pulsations, because they leave distinct s…
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…
Study of HD 169392A observed by CoRoT and HARPS
S. Mathur, H. Bruntt, C. Catala +25
The numerous results obtained with asteroseismology thanks to space missions such as CoRoT and Kepler are providing a new insight on stellar evolution. After five years of observat…
Exploring the magnetic topologies of cool stars
J. Morin, J. -F. Donati, P. Petit +19
Magnetic fields of cool stars can be directly investigated through the study of the Zeeman effect on photospheric spectral lines using several approaches. With spectroscopic measur…
Magnetic fields and chemical peculiarities of the very young intermediate-mass binary system HD 72106
C. P. Folsom, G. A. Wade, O. Kochukhov +9
The recently discovered magnetic Herbig Ae and Be stars may provide qualitatively new information about the formation and evolution of magnetic Ap and Bp stars. We have performed a…
Line profile variations in Doradus
L. A. Balona, T. Böhm, B. H. Foing +11
We present data from high-dispersion echelle spectra and simultaneous photometry for ~Doradus. These data were obtained from several sites during 1994 November as part o…
Magnetic topologies of the Herbig Ae/Be stars
E. Alecian, G. A. Wade, C. Catala +9
Our recent discoveries of magnetic fields in a small number of Herbig Ae/Be (HAeBe) stars, the evolutionary progenitors of main sequence A/B stars, raise new questions about the or…
Short-lived spots in solar-like stars as observed by CoRoT
B. Mosser, F. Baudin, A. F. Lanza +4
Context. CoRoT light curves have an unprecedented photometric quality, having simultaneously a high signal-to-noise ratio, a long time span and a nearly continuous duty-cycle. Aims…
How non-magnetic are "non-magnetic" Herbig Ae/Be stars?
G. A. Wade, E. Alecian, C. Catala +9
Our recent discovery of magnetic fields in a small number of Herbig Ae/Be stars has required that we survey a much larger sample of stars. From our FORS1 and ESPaDOnS surveys, we h…
Magnetism in pre-MS intermediate-mass stars and the fossil field hypothesis
E. Alecian, G. A. Wade, C. Catala +11
Today, one of the greatest challenges concerning the Ap/Bp stars is to understand the origin of their slow rotation and their magnetic fields. The favoured hypothesis for the latte…
HD 46375: seismic and spectropolarimetric analysis of a young Sun hosting a Saturn-like planet
P. Gaulme, S. Deheuvels, W. W. Weiss +13
HD 46375 is known to host a Saturn-like exoplanet orbiting at 0.04 AU from its host star. Stellar light reflected by the planet was tentatively identified in the 34-day CoRoT run a…
Magnetism and rotation in Herbig Ae/Be stars
E. Alecian, G. A. Wade, C. Catala +8
Among the main sequence intermediate mass A and B stars, around 5% host large-scale organized magnetic fields. Most of these stars are very slow rotators compared to their non-magn…
The CoRoT target HD175726: an active star with weak solar-like oscillations
B. Mosser, E. Michel, T. Appourchaux +17
Context. The CoRoT short runs give us the opportunity to observe a large variety of late-type stars through their solar-like oscillations. We report observations of the star HD1757…
Pulsation spectrum of Delta Sct stars: the binary HD 50870 as seen with CoRoT and HARPS
L. Mantegazza, E. Poretti, E. Michel +14
We present the results obtained with the CoRoT satellite for HD 50870, a Delta Sct star which was observed for 114.4 d. The 307,570 CoRoT datapoints were analysed with different te…
Discovery of fossil magnetic fields in the intermediate-mass pre-main sequence stars
E. Alecian, G. A. Wade, C. Catala
It is now well-known that the surface magnetic fields observed in cool, lower-mass stars on the main sequence (MS) are generated by dynamos operating in their convective envelopes.…
Magnetism, rotation and accretion in Herbig Ae-Be stars
E. Alecian, G. A. Wade, C. Catala +7
Studies of stellar magnetism at the pre-main sequence phase can provide important new insights into the detailed physics of the late stages of star formation, and into the observed…
The CoRoT B-type binary HD50230: a prototypical hybrid pulsator with g-mode period and p-mode frequency spacings
P. Degroote, C. Aerts, E. Michel +14
B-type stars are promising targets for asteroseismic modelling, since their frequency spectrum is relatively simple. We deduce and summarise observational constraints for the hybri…
Accurate p-mode measurements of the G0V metal-rich CoRoT target HD 52265
J. Ballot, L. Gizon, R. Samadi +27
The star HD 52265 is a G0V metal-rich exoplanet-host star observed in the seismology field of the CoRoT space telescope from November 2008 to March 2009. The satellite collected 11…