0000000001011922

AUTHOR

A.-m. Hubert

showing 3 related works from this author

A photometric study of Be stars located in the seismology fields of COROT

2007

Context: In preparation for the COROT mission, an exhaustive photometric study of Be stars located in the seismology fields of the COROT mission has been performed. The very precise and long-time-spanned photometric observations gathered by the COROT satellite will give important clues of the origin of the Be phenomenon. Aims: The aim of this work is to find short-period variable Be stars located in the seismology fields of COROT and to study and characterise their pulsational properties. Methods: Light curves obtained at the Observatorio de Sierra Nevada together with data from Hipparcos and ASAS-3 of a total of 84 Be stars have been analysed in order to search for short-term variations. W…

statistics [Stars]:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::Otras [UNESCO]FOS: Physical sciencesoscillations (including pulsations) [Stars]Context (language use)AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics01 natural sciences0103 physical sciencesUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::OtrasAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsPhysics010308 nuclear & particles physicsphotometric [Techniques]Astrophysics (astro-ph)Astronomy and AstrophysicsLight curveStars : emission-line Be; Stars : oscillations (including pulsations); Stars : statistics; Techniques : photometricStarsemission-line Be [Stars]Space and Planetary ScienceSatelliteAstrophysics::Earth and Planetary AstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::EstrellasSeismology:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::Estrellas [UNESCO]
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Pulsations of HD 181231

2009

HD181231 is a B5IVe star, which has been observed with the CoRoT satellite during ~5 consecutive months and simultaneously from the ground in spectroscopy and spectropolarimetry. By analysing these data, we aim to detect and characterize as many pulsation frequencies as possible, to search for the presence of beating effects possibly at the origin of the Be phenomenon. Our results will also provide a basis for seismic modelling. The fundamental parameters of the star are determined from spectral fitting and from the study of the circumstellar emission. The CoRoT photometric data and ground-based spectroscopy are analysed using several Fourier techniques: Clean-ng, Pasper, and Tisaft, as wel…

observational astronomyEarly type starsAstrophysics and AstronomyExoplanet AstronomyEarly-type starsStellar AstronomyBe starsPhysicsPolarimetryAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary AstrophysicsNatural SciencesSpectroscopy
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Fourier analysis of HD 49330 CoRoT light curve

2009

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. We analyze the pulsational behavior of the early B0.5IVe star HD 49330 observed during the first CoRoT long run towards the Galactical anticenter (LRA1). This Be star is located close to the lower edge of the {beta} Cephei instability strip in the HR diagram and showed a 0.03mag outburst during the CoRoT observations. It is thus an ideal case for testing the aforementioned hypothesis.

Photometryobservational astronomyEarly type starsAstrophysics and AstronomyEarly-type starsStellar AstronomyBe starsAstrophysics::High Energy Astrophysical PhenomenaPhysicsAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary AstrophysicsNatural SciencesAstrophysics::Galaxy Astrophysics
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