Discovery of a ZZ Ceti in the Kepler Mission Field

Details Discovery of a ZZ Ceti in the Kepler Mission Field Discovery of a ZZ Ceti in the Kepler Mission Field

2011-09-27

arxiv.org/abs/1109.6023v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

12 pages, 3 figures, accepted for publication in the Astrophysical Journal Letters

Scientific paper

We report the discovery of the first identified pulsating DA white dwarf in the field of the Kepler mission, WD J1916+3938 (Kepler ID 4552982). This ZZ Ceti star was first identified through ground-based, time-series photometry, and follow-up spectroscopy confirm it is a hydrogen-atmosphere white dwarf with an effective temperature = 11,129 $\pm$ 115 K and log g = 8.34 $\pm$ 0.06, placing it within the empirical ZZ Ceti instability strip. The object shows up to 0.5 percent amplitude variability at several periods between 800 -- 1450 s. Extended Kepler observations of this object could yield the best lightcurve, to-date, of any pulsating white dwarf, allowing us to directly study the interior of an evolved object representative of the fate of the majority of stars in our Galaxy.

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