An asteroseismic study of the O9V star HD 46202 from CoRoT space-based photometry

  title={An asteroseismic study of the O9V star HD 46202 from CoRoT space-based photometry},
  author={Maryline Briquet and Conny Aerts and Annie Baglin and M. Fernanda Nieva and Pieter Degroote and Norbert Przybilla and Alfred F. Noels and Florian Schiller and M. Vu{\vc}kovi{\'c} and Raquel Oreiro and Kris Smolders and Michel Auvergne and Frédéric Baudin and Claude Catal{\`a} and Eric Michel and R'eza Samadi},
  journal={Astronomy and Astrophysics},
The O9V star HD46202, 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 very high-precision light curve, we clearly detect β Cep-like pulsation frequencies with amplitudes of ∼0.1 mmag and below. A comparison with stellar models was performed using a χ 2 as a measure for the goodness-of-fit between the observed and theoretically computed frequencies. The physical parameters of our best… 

CoRoT high-precision photometry of the B0.5 IV star HD 51756

Context. 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 on current

Variability in the CoRoT photometry of three hot O-type stars HD 46223, HD 46150, and HD 46966

Context. 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 provided

Seismic modelling of the β Cephei star HD 180642 (V1449 Aquilae)

Context. We present modelling of the β Cep star HD 180642 based on its observational properties deduced from CoRoT and ground-based photometry as well as from time-resolved spectroscopy. Aims. We

Gravito-inertial and pressure modes detected in the B3 IV CoRoT target HD 43317

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 provide feedback on the

Low-amplitude rotational modulation rather than pulsations in the CoRoT B-type supergiant HD 46769

Aims. We aim to detect and interpret photometric and spectroscopic variability of the bright CoRoT B-type supergiant target HD 46769 (V = 5:79). We also attempt to detect a magnetic field in the

Extensive study of HD 25558, a long-period double-lined binary with two SPB components

We carried out an extensive observational study of the Slowly Pulsating B (SPB) star, HD 25558. The ≈2000 spectra obtained at different observatories, the ground-based and MOST satellite light curves

MOST detects corotating bright spots on the mid-O-type giant ξ Persei

We have used the MOST (Microvariability and Oscillations of STars) microsatellite to obtain four weeks of contiguous high-precision broad-band visual photometry of the O7.5III(n)((f)) star ξ Persei

A quantitative study of the O stars in NGC 2244

NGC 2244 located in the Rosette Nebula is a young open cluster composed of seven O-type stars. A first paper focused on the multiplicity of these stars, revealed only one binary system out of the


Recent progress in the seismic interpretation of field β Cep stars has resulted in improvements of the physical description in the stellar structure and evolution model computations of massive stars.

Variability of OB stars from TESS southern Sectors 1–13 and high-resolution IACOB and OWN spectroscopy

Context. The lack of high-precision long-term continuous photometric data for large samples of stars has impeded the large-scale exploration of pulsational variability in the OB star regime. As a



The B0.5IVe CoRoT target HD 49330 - I. Photometric analysis from CoRoT data

Context. Be stars undergo outbursts producing a circumstellar disk from the ejected material. The beating of non-radial pulsations has been put forward as a possible mechanism of ejection. Aims. We

An asteroseismic study of the β Cephei star θ Ophiuchi: constraints on global stellar parameters and core overshooting

We present a seismic study of the β Cephei star θ Ophiuchi. Our analysis is based on the observation of one radial mode, one rotationally split � = 1 triplet and three components of a rotationally

Detection of frequency spacings in the young O-type binary HD 46149 from CoRoT photometry

Aims. Using the CoRoT space based photometry of the O-type binary HD 46149, stellar atmospheric effects related to rotation can be separated from pulsations, because they leave distinct signatures in

Plaskett's Star: Analysis of the CoRoT photometric data ?

Context. The second short run (SRa02) of the CoRoT space mission for asteroseismology was partly devoted to stars belonging to the Mon OB2 association. An intense monitoring has been performed on

Asteroseismology of the β Cephei star 12 (DD) Lacertae : photometric observations, pulsational frequency analysis and mode identification

We report a multisite photometric campaign for the beta Cephei star 12 Lacertae. 750 h of high-quality differential photoelectric Str�mgren, Johnson and Geneva time-series photometry were obtained

The spectral variability of HD 192639 and its implications for the star's wind structure

We report the analysis of an extensive set of spectroscopic data of the O(f) supergiant HD 192639. A Fourier analysis of our time-series reveals a recurrent variability with a “period” of roughly 4.8

Evidence for nonlinear resonant mode coupling in the β Cephei star HD 180642 (V1449 Aquilae) from CoRoT photometry

Context. We present the CoRoT light curve of the β Cep star HD 180642, assembled during the first long run of the space mission, as well as archival single-band photometry. Aims. Our goal is to

The two hybrid B-type pulsators: ν Eridani and 12 Lacertae

The rich oscillation spectra determined for the two stars, ν Eridani and 12 Lacertae, present an interesting challenge to stellar modelling. The stars are hybrid objects showing not only a number of

Spectroscopic and photometric variability of the O9.5Vp star HD93521

Aims. The line profile variability and photometric variability of the O9.5 Vp star HD 93521 are examined in order to establish the properties of the non-radial pulsations in this star. Methods.

Spectropolarimetric observations of active stars

This paper reports the results of five years (five runs, 23 nights) of spectropolarimetric observations of active stars with the UCL Echelle Spectrograph of the Anglo-Australian Telescope. 225