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Progress on the Front of Pulsating Subdwarf B Stars |
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| Authors: | Gilles Fontaine Elizabeth M. Green Pierre Brassard Stéphane Charpinet Pierre Chayer Malvina Billères Suzanna K. Randall Ben Dorman |
| Affiliation: | 1. Département de Physique, Université de Montréal, Canada 2. Steward Observatory, University of Arizona, Tucson, USA 3. Laboratoire d’astrophysique (UMR 5572), Observatoire Midi-Pyrénées, Toulouse, France 4. Bloomberg Center for Physics and Astronomy, Johns Hopkins University, Baltimore, USA 5. European Southern Observatory, Santiego Headquarters, Santiago, Chili 6. Goddard Space Flight Center, NASA, Greenbelt, USA |
| Abstract: | We briefly review the recent advances that have been made on the front of pulsating subdwarf B (sdB) stars. The first family of sdB pulsators, the EC 14026 stars, was discovered a few years ago and consists of short-period (～100?200 s) p-mode variables. The second type of pulsating sdB’s consists of the PG 1716+426 stars, a group of variables showing long-period (～1 h) g-mode pulsations. The existence of the latter was first reported less than a year ago. While the two types of sdB pulsators differ markedly in their observational characteristics, we recently found a unifying property in the sense that the observed modes in these objects are excited through the same driving process, a classic kappa mechanism associated with the radiative levitation of iron in the stellar envelope. |
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