Discovery of a rapidly pulsating subdwarf B star candidate in omega Cen

Details Discovery of a rapidly pulsating subdwarf B star candidate in omega Cen Discovery of a rapidly pulsating subdwarf B star candidate in omega Cen

2008-12-14

arxiv.org/abs/0812.2684v1

Astronomy and Astrophysics

Astrophysics

5 pages, 7 figures; accepted for publication in A&A

Scientific paper

10.1051/0004-6361:200811266

We report the discovery of the first variable extreme horizontal branch star in a globular cluster (omega Cen). The oscillation uncovered has a period of 114 s and an amplitude of 32 mmags. A comparison between horizontal branch models and observed optical colours indicates an effective temperature of 31,500+-6,300 K for this star, placing it within the instability strip for rapidly oscillating B subdwarfs. The time scale and amplitude of the pulsation detected are also in line with what is expected for this type of variable, thus strengthening the case for the discovery of a new subdwarf B pulsator.

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