Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap%26ss.329..217v&link_type=abstract
Astrophysics and Space Science, Volume 329, Issue 1-2, pp. 217-224
Astronomy and Astrophysics
Astrophysics
3
Stars: Oscillations, Stars: Interiors, Stars: Subdwarfs, Stars: Individual: Pg 1605+072
Scientific paper
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.
Brassard Pierre
Charpinet Stephane
Fontaine Gérard
van Grootel V.
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