At Last—A V777 Her Pulsator in the Kepler Field

Details At Last—A V777 Her Pulsator in the Kepler Field At Last—A V777 Her Pulsator in the Kepler Field

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...736l..39o&link_type=abstract

The Astrophysical Journal Letters, Volume 736, Issue 2, article id. L39 (2011).

Astronomy and Astrophysics

Astronomy

7

Stars: Individual: Galex J192904.6+444708, Stars: Oscillations, Stars: Variables: General, White Dwarfs

Scientific paper

We present the discovery of the first—and so far the only—pulsating white dwarf star located in the field of view of the Kepler spacecraft. During our ongoing effort to search for compact pulsator candidates that can benefit from the near-continuous coverage of Kepler, we recently identified a faint DB star from spectroscopy obtained with the William Herschel Telescope. After establishing its physical parameters to be T eff = 24,950 K and log g = 7.91 dex, placing it right in the middle of the V777 Her instability strip, we immediately submitted the target for follow-up space observations. The Kepler light curve reveals a pulsation spectrum consisting of five modes that follow a sequence roughly equally spaced in period with a mean spacing of 37 s. The three strongest modes show a triplet structure with a mean splitting of 3.3 μHz. We conclude that this object is a V777 Her pulsator with a mass of ~0.56 M sun, and very similar to the class prototype.

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