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

Briquet, M. ; Aerts, C. ; Baglin, A. ; Nieva, M. F. ; Degroote, P. ; Przybilla, N. ; Noels, A. ; Schiller, F. ; Vučković, M. ; Oreiro, R. ; Smolders, K. ; Auvergne, M. ; Baudin, F. ; Catala, C. ; Michel, E. ; Samadi, R.

Astronomy and astrophysics (Berlin), 2011-03, Vol.527, p.A112 [Periódico revisado por pares]

Les Ulis: EDP Sciences

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Título:
An asteroseismic study of the O9V star HD 46202 from CoRoT space-based photometry
Autor: Briquet, M. ; Aerts, C. ; Baglin, A. ; Nieva, M. F. ; Degroote, P. ; Przybilla, N. ; Noels, A. ; Schiller, F. ; Vučković, M. ; Oreiro, R. ; Smolders, K. ; Auvergne, M. ; Baudin, F. ; Catala, C. ; Michel, E. ; Samadi, R.
Assuntos: asteroseismology ; Astronomy ; Astrophysics ; Aérospatiale, astronomie & astrophysique ; Earth, ocean, space ; Exact sciences and technology ; Physical, chemical, mathematical & earth Sciences ; Physics ; Physique, chimie, mathématiques & sciences de la terre ; Space science, astronomy & astrophysics ; stars: early-type ; stars: individual: HD 46202 ; stars: oscillations ; stars: variables: general
É parte de: Astronomy and astrophysics (Berlin), 2011-03, Vol.527, p.A112
Notas: ark:/67375/80W-7JP2LHV2-B
publisher-ID:aa15690-10
dkey:10.1051/0004-6361/201015690
Postdoctoral Fellow of the Fund for Scientific Research of Flanders (FWO), Belgium.
The CoRoT space mission was developed and is operated by the French space agency CNES, with the participation of ESA’s RSSD and Science Programmes, Austria, Belgium, Brazil, Germany, and Spain.
istex:216055C205956DC16E5B38A933BA0CBA46D765E0
bibcode:2011A%26A...527A.112B
scopus-id:2-s2.0-79551704484
Descrição: 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 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 χ2 as a measure for the goodness-of-fit between the observed and theoretically computed frequencies. The physical parameters of our best-fitting models are compatible with the ones deduced spectroscopically. A core overshooting parameter αov = 0.10 ± 0.05 pressure scale height is required. None of the observed frequencies are theoretically excited with the input physics used in our study. More theoretical work is thus needed to overcome this shortcoming in how we understand the excitation mechanism of pulsation modes in such a massive star. A similar excitation problem has also been encountered for certain pulsation modes in β Cep stars recently modelled asteroseismically.
Editor: Les Ulis: EDP Sciences
Idioma: Inglês

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

Briquet, M. ; Aerts, C. ; Baglin, A. ; Nieva, M. F. ; Degroote, P. ; Przybilla, N. ; Noels, A. ; Schiller, F. ; Vučković, M. ; Oreiro, R. ; Smolders, K. ; Auvergne, M. ; Baudin, F. ; Catala, C. ; Michel, E. ; Samadi, R.

Les Ulis: EDP Sciences

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