Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-14
Astrophys.J. 583 (2003) L31-L34; Astrophys.Space Sci. 284 (2003) 65-68
Astronomy and Astrophysics
Astrophysics
11 pages AASTEX, 2 figures (Fig. 2 in color), conference proceeding replaced by expanded article accepted by ApJ Letters
Scientific paper
During the course of an ongoing CCD monitoring program to investigate low-level light variations in subdwarf B (sdB) stars, we have serendipitously discovered a new class of low amplitude, multimode sdB pulsators with periods of the order of an hour. These periods are more than a factor of ten longer than those of previously known multimode sdB pulsators (EC 14026 stars), implying that they are due to gravity modes rather than pressure modes. The longer period pulsators are found only among cooler sdB stars, where they are surprisingly common. The iron opacity instability that drives the short period EC 14026 stars is effective only in hot sdB's, leaving the driving mechanism for the deeper gravity modes in cool sdB's currently unknown. We present the first observational results for our newly identified sdB variables, and discuss possible implications.
Brassard Pierre
Bronowska A.
Callerame Keith
Cordes Oliver
Dreizler Stefan
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