The original manuscript is accessible at: http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9527426&fulltextType=RA&fileId=S1743921314006693
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[en] A recent photometric survey in the NGC 3766 cluster led to the detection of stars presenting an unexpected variability. They lie in a region of the Hertzsprung-Russell (HR) diagram where no pulsation are theoretically expected, in between the δ Scuti and slowly pulsating B (SPB) star instability domains. Their variability periods, between ~0.1-0.7 d, are outside the expected domains of these well-known pulsators. The NCG 3766 cluster is known to host fast rotating stars. Rotation can significantly affect the pulsation properties of stars and alter their apparent luminosity through gravity darkening. Therefore we inspect if the new variable stars could correspond to fast rotating SPB stars. We carry out instability and visibility analysis of SPB pulsation modes within the frame of the traditional approximation. The effects of gravity darkening on typical SPB models are next studied. We find that at the red border of the SPB instability strip, prograde sectoral (PS) modes are preferentially excited, with periods shifted in the 0.2-0.5 d range due to the Coriolis effect. These modes are best seen when the star is seen equator-on. For such inclinations, low-mass SPB models can appear fainter due to gravity darkening and as if they were located between the δ Scuti and SPB instability strips.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Salmon, Sébastien ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Montalbán, J.; Département d'Astrophysique, Géophysique et Océanographie, Université de Liège, Allée du 6 Août 17, 4000 Liège, Belgium
Reese, D. R.; School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
Dupret, Marc-Antoine ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Eggenberger, P.; Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290 Sauverny, Switzerland)
Language :
English
Title :
Are the stars of a new class of variability detected in NGC 3766 fast rotating SPB stars?
Publication date :
01 January 2015
Event name :
International Astronomical Union Symposium 307 - New Windows on Massive Stars, Asteroseismology, Interferometry and Spectropolarimetry
Event organizer :
Université de Genève
Event place :
Genève, Switzerland
Event date :
23-27 juin 2014
Audience :
International
Main work title :
Proceedings of the International Astronomical Union S307
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Bibliography
Aidelman, Y., Cidale, L. S., Zorec, J., & Arias, M. L. 2012, A&A 544, A64
Ballot, J., Lignières, F., Prat, V., Reese, D. R., & Rieutord, M. 2012, in H. Shibahashi, M. Takata, & A. E. Lynas-Gray (eds.), Progress in Solar/Stellar Physics with Helio- and Asteroseismology, Vol. 462 of ASP Conf. Ser., p. 389
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