Reference : The empirical mass distributions of hot B subdwarfs derived by asteroseismology
Scientific congresses and symposiums : Unpublished conference
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
The empirical mass distributions of hot B subdwarfs derived by asteroseismology
Van Grootel, Valérie mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Fontaine, Gilles [ > > ]
Brassard, Pierre [ > > ]
Charpinet, Stéphane [ > > ]
Green, Elizabeth M [ > > ]
Randall, Suzanna K [ > > ]
The Impact of Asteroseismology across Stellar Astrophysics
du 24 au 28 octobre 2011
Kavli Institute for Theoretical Physics (University of California)
Santa Barbara
United States
[en] Detailed asteroseismic analyses of 15 pulsating B subdwarfs have been published since a decade, including estimates of the masses of these stars. We present in this talk the empirical mass distribution for hot B subdwarfs on the basis of this sample. We find a sharp mass distribution with a mean mass of 0.470 Msun, a median value of 0.471 Msun, and 68.3% of the stars fall in the narrow range of mass 0.441-0.499 Msun. In a second experiment, we augment our sample with the addition of 5 hot B subdwarfs components of eclipsing binaries, with masses reliably determined by light curve modeling and spectroscopy. The new mass distribution is very similar to the former one with a mean mass of 0.469 Msun, a median value of 0.471 Msun, and a range 0.436-0.501 Msun containing 68.3% of the stars. We also discuss in this talk how these empirical mass distributions, although still based on small-number statistics, compare with the expectations of stellar evolution theory.

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