Progress on the Front of Pulsating Subdwarf B Stars

Details Progress on the Front of Pulsating Subdwarf B Stars Progress on the Front of Pulsating Subdwarf B Stars

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ap%26ss.291..379f&link_type=abstract

Astrophysics and Space Science, v. 291, Issue 3, p. 379-386 (2004).

Astronomy and Astrophysics

Astrophysics

6

Hot B Subdwarfs, Stellar Oscillations

Scientific paper

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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