期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 741, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/741/1/L16
关键词
stars: individual (WD J191643.83+393849.7); stars: oscillations; stars: variables: general; white dwarfs
资金
- Norman Hackerman Advanced Research Program [003658-0255-2007, 003658-0252-2009]
- NASA [NAG5-13094]
- National Science Foundation [AST-0909107]
- European Research Council under the European Community [227224]
- Research Council of K.U. Leuven [GOA/2008/04]
- Science and Technology Facilities Council [PP/D000955/1, ST/J000035/1, ST/G002355/1, PP/F000057/1] Funding Source: researchfish
- STFC [ST/J000035/1, ST/G002355/1, PP/D000955/1, PP/F000057/1] Funding Source: UKRI
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0909107] Funding Source: National Science Foundation
We report the discovery of the first identified pulsating DA white dwarf, WD J1916+3938 (Kepler ID 4552982), in the field of the Kepler mission. This ZZ Ceti star was first identified through ground-based, time-series photometry, and follow-up spectroscopy confirms that it is a hydrogen-atmosphere white dwarf with T(eff) = 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% amplitude variability at several periods between 800 and 1450 s. Extended Kepler observations of WD J1916+3938 could yield the best light curve, 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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