Unpublished conference/Abstract (Scientific congresses and symposiums)
Internal dynamics from asteroseismology for two sdB pulsators residing in close binary systems
Van Grootel, Valérie; Charpinet, Stéphane; Fontaine, Gilles et al.
2008Wroclaw Helas workshop
 

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Abstract :
[en] Since their discovery eleven years ago, short-period pulsating sdB stars have proved their potential for quantitative asteroseismological studies. We have recently updated our asteroseismic diagnostic tools in order to incorporate the effects of stellar rotation on pulsations, assuming various internal rotation laws. It was possible, with these new tools, to determine the internal rotation profile of two short-period pulsating sdB stars residing in close binary systems, namely Feige 48 and PG 1336−018. They exhibit orbital periods of, respectively, 9.024 h and 2.424 h measured from spectroscopy. For the two stars, we show that spin-orbit synchronism is reached from the surface down to ∼ 0.22 R∗ and 0.55 R∗, respectively. The rotation of deeper layers cannot be inferred with the type of modes observed in short-period pulsating sdB stars. These results could also provide new elements to test tidal friction theories, particularly the angular momentum transport, in close binary systems.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Van Grootel, Valérie  ;  Université de Toulouse/Université de Montréal (UdeM)
Charpinet, Stéphane
Fontaine, Gilles
Brassard, Pierre
Reese, Daniel
Language :
English
Title :
Internal dynamics from asteroseismology for two sdB pulsators residing in close binary systems
Publication date :
June 2008
Event name :
Wroclaw Helas workshop
Event organizer :
Uniwersytet Wroclawski
Event place :
Wroclaw, Poland
Event date :
du 23 au 27 juin 2008
Audience :
International
Available on ORBi :
since 23 January 2012

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