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Photometric variability of the Be star CoRoT-ID 102761769

Emilio, M. ; Andrade, L. ; Janot-Pacheco, E. ; Baglin, A. ; Gutiérrez-Soto, J. ; Suárez, J. C. ; de Batz, B. ; Diago, P. ; Fabregat, J. ; Floquet, M. ; Frémat, Y. ; Huat, A. L. ; Hubert, A. M. ; Espinosa Lara, F. ; Leroy, B. ; Martayan, C. ; Neiner, C. ; Semaan, T. ; Suso, J.

Astronomy and astrophysics (Berlin), 2010-11, Vol.522, p.A43 [Periódico revisado por pares]

Les Ulis: EDP Sciences

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  • Título:
    Photometric variability of the Be star CoRoT-ID 102761769
  • Autor: Emilio, M. ; Andrade, L. ; Janot-Pacheco, E. ; Baglin, A. ; Gutiérrez-Soto, J. ; Suárez, J. C. ; de Batz, B. ; Diago, P. ; Fabregat, J. ; Floquet, M. ; Frémat, Y. ; Huat, A. L. ; Hubert, A. M. ; Espinosa Lara, F. ; Leroy, B. ; Martayan, C. ; Neiner, C. ; Semaan, T. ; Suso, J.
  • Assuntos: Astronomy ; Astrophysics ; Earth, ocean, space ; Exact sciences and technology ; Physics ; stars: early-type ; stars: emission-line ; stars: individual: CoRoT-ID 102761769 ; stars: oscillations ; stars: rotation
  • É parte de: Astronomy and astrophysics (Berlin), 2010-11, Vol.522, p.A43
  • Notas: ark:/67375/80W-6138G4MF-B
    istex:EC2FADC79808E252C583E313A14EAA3E3AB867EA
    publisher-ID:aa14081-10
    dkey:10.1051/0004-6361/201014081
    The CoRoT space mission was developed and is operated by the French space agency CNES, with participation of ESA’s RSSD and Science Programmes, Austria, Belgium, Brazil, Germany, and Spain.
    bibcode:2010A%26A...522A..43E
    e-mail: memilio@uepg.br
  • Descrição: 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 cd-1 (28.5 μHz) and 2.441 cd-1 (28.2 μHz). The precision to which those frequencies were found is 0.018 cd-1 (0.2 μHz). The projected stellar rotation was estimated to be 120 kms-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 cd-1 (40.5 μHz), which implies that the above frequencies are really caused by stellar pulsations rather than star’s rotation.
  • Editor: Les Ulis: EDP Sciences
  • Idioma: Inglês
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