[en] The hot pulsating sdB star PG 1605+072 exhibits uncommon spectroscopic and pulsation properties, and is one of the biggest challenge in the field of sdB star modeling. Two hypotheses have been proposed to explain its unusually rich pulsation spectrum. The first is the natural explanation of a fast-rotating pulsator, which lifts the (2 l+1)-fold degeneracy of the frequency components. Another approach, where PG 1605+072 can be seen as a slow rotator, considers that the numerous low amplitude frequency components are second- and third-order harmonics and nonlinear combinations of the highest amplitude frequencies. We investigated the two hypotheses in the light of asteroseismology, using our latest tools—including pulsation codes that incorporate star rotation and new generation complete sdB models. The results of both approaches are presented, showing interesting results and raising new questions for our understanding of this mysterious sdB star.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Van Grootel, Valérie ; Université de Toulouse > Laboratoire d'Astrophysique de Toulouse-Tarbes (LATT)
Charpinet, Stéphane
Fontaine, Gilles
Brassard, Pierre
Language :
English
Title :
Progress in the asteroseismic analysis of the pulsating sdB star PG 1605+072
Publication date :
October 2010
Event name :
Fourth meeting on hot B subdwarfs and related objects
Event place :
Shanghai, China
Event date :
du 20 au 24 juillet 2009
Audience :
International
Journal title :
Astrophysics and Space Science
ISSN :
0004-640X
eISSN :
1572-946X
Publisher :
Springer Science & Business Media B.V., Dordrecht, Netherlands
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Bibliography
Brassard, P., Fontaine, G., (2008) ASP Conf. Ser., 392, p. 261
Brassard, P., Fontaine, G., (2009) J. Phys. Conf. Ser., 172, p. 2016
Brassard, P., Fontaine, G., Billeres, M., (2001) Astrophys. J., 563, p. 1013
Brassard, P., Pelletier, C., Fontaine, G., Wesemael, F., (1992) Astrophys. J. Suppl. Ser., 80, p. 725
Charpinet, S., Fontaine, G., Brassard, P., (1997) Astrophys. J. Lett., 483, pp. L123
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