Reference : Modeling the hot subdwarf PB 8783 by asteroseismology
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Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
Modeling the hot subdwarf PB 8783 by asteroseismology
Van Grootel, Valérie mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Charpinet, Stephane []
Fontaine, Gilles []
Brassard, Pierre []
Green, Elizabeth M. []
Astronomical Society of the Pacific Conference Series
Astronomical Society of the Pacific
San Francisco
Sixth meeting on hot subdwarfs and related objects
19-24 mai 2013
Elizabeth M. Green
[en] We present the preliminary seismic modeling of one of the hottest and most compact subdwarf pulsators, PB 8783 (EO Ceti). This is a well observed hot subdwarf star, including a 78 d campaign in white light photometry that we carried out at Mount Bigelow, Arizona, during the fall 2007. PB 8783 has also been observed at length in spectroscopy, revealing a spectrum highly contaminated by a main sequence companion. It is extremely difficult to disentangle the contribution of the two components and, as a consequence of this, the exact nature of the hot subdwarf (sdB or sdO star) is undetermined. We propose here to test the two hypotheses by asteroseismology. Although the sdB possibility cannot be excluded, the pulsation modes observed in PB 8783 are much better accommodated in the case of an sdO star.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
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