Discovery of a ZZ Ceti in the Kepler Mission Field
Hermes, J. J. · Mullally, Fergal · Østensen, R. H. · Williams, Kurtis A. · Telting, John · Southworth, John · Bloemen, S. · Howell, Steve B. · Everett, Mark · Winget, D. E.
Original · EN
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 ± 115 K and log g = 8.34 ± 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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