Rapid extreme horizontal branch pulsators in ω Centauri

Details Rapid extreme horizontal branch pulsators in ω Centauri Rapid extreme horizontal branch pulsators in ω Centauri

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap%26ss.329...55r&link_type=abstract

Astrophysics and Space Science, Volume 329, Issue 1-2, pp. 55-62

Astronomy and Astrophysics

Astrophysics

2

Ehb Stars, Globular Clusters, Pulsating Stars, Sdb Stars, Variable Stars

Scientific paper

We present the first results of an observational campaign aimed at detecting rapid extreme horizontal branch (EHB) pulsators in globular clusters. So far, we have observed multi-frequency luminosity variations for three EHB stars in ω Cen, with typical periods in the 100-120 s range. This is towards the short end, but comparable to, the periodicities measured for rapidly pulsating subdwarf B (sdB) stars in the field. Given that the effective temperatures of the variables discovered seem to be compatible with the instability strip for fast sdB pulsators, we believe we have uncovered the first such variables in a globular cluster.

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