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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2010

Photometric variability of the Be star CoRoT-ID 102761769

Résumé

Context. Classical Be stars are rapid rotators of spectral type late O to early A and luminosity class V-III, which exhibit Balmer emission lines and often a near infrared excess originating in an equatorially concentrated circumstellar envelope, both produced by sporadic mass ejection episodes. The causes of the abnormal mass loss (the so-called Be phenomenon) are as yet unknown.
Aims: For the first time, we can now study in detail Be stars outside the Earth's atmosphere with sufficient temporal resolution. We investigate the variability of the Be Star CoRoT-ID 102761769 observed with the CoRoT satellite in the exoplanet field during the initial run.
Methods: One low-resolution spectrum of the star was obtained with the INT telescope at the Observatorio del Roque de los Muchachos. A time series analysis was performed using both cleanest and singular spectrum analysis algorithms to the CoRoT light curve. To identify the pulsation modes of the observed frequencies, we computed a set of models representative of CoRoT-ID 102761769 by varying its main physical parameters inside the uncertainties discussed.
Results: We found two close frequencies related to the star. They are 2.465 c d-1 (28.5 muHz) and 2.441 c d-1 (28.2 muHz). The precision to which those frequencies were found is 0.018 c d-1 (0.2 muHz). The projected stellar rotation was estimated to be 120 km s-1 from the Fourier transform of spectral lines. If CoRoT-ID 102761769 is a typical Galactic Be star it rotates near the critical velocity. The critical rotation frequency of a typical B5-6 star is about 3.5 c d-1 (40.5 muHz), which implies that the above frequencies are really caused by stellar pulsations rather than star's rotation.

Dates et versions

hal-03742206 , version 1 (02-08-2022)

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Marcelo Emilio, L. Andrade, Eduardo Janot-Pacheco, Annie Baglin, Juan Gutiérrez, et al.. Photometric variability of the Be star CoRoT-ID 102761769. Astronomy and Astrophysics - A&A, 2010, 522, pp.43. ⟨10.1051/0004-6361/201014081⟩. ⟨hal-03742206⟩
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