期刊
ASTROPHYSICAL JOURNAL
卷 809, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/809/1/14
关键词
stars: activity; stars: individual (KIC 4552982, WD J191643.83+393849.7); stars: oscillations; white dwarfs
资金
- NSF [AST-0909107, AST-1312983]
- Norman Hackerman Advanced Research Program [003658-0252-2009]
- Kepler Cycle 4 GO proposal [11-KEPLER11-0050]
- NASA [NNX12AC96G, NAS5-26555]
- European Research Council under the European Union's Seventh Framework Programme (FP)/ERC Grant [320964]
- NASA Science Mission Directorate
- NASA Office of Space Science [NAG5-7584]
- University of Arizona
- Lockheed Martin Advanced Technology Center
- NASA [52440, NNX12AC96G] Funding Source: Federal RePORTER
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1312983] Funding Source: National Science Foundation
We present the Kepler light curve of KIC 4552982, the first ZZ Ceti (hydrogen-atmosphere pulsating white dwarf star) discovered in the Kepler field of view. Our data span more than 1.5 years, with a 86% duty cycle, making it the longest pseudo-continuous light curve ever recorded for a ZZ Ceti. This extensive data set provides the most complete coverage to date of amplitude and frequency variations in a cool ZZ Ceti. We detect 20 independent frequencies of variability in the data that we compare with asteroseismic models to demonstrate that this star has a mass M-* > 0.6 M.. We identify a rotationally split pulsation mode and derive a probable rotation period for this star of 17.47 +/- 0.04 hr. In addition to pulsation signatures, the Kepler light curve exhibits sporadic, energetic outbursts that increase the star's relative flux by 2%-17%, last 4-25 hr, and recur on an average timescale of 2.7 days. These are the first detections of a new dynamic white dwarf phenomenon that may be related to the pulsations of this relatively cool (T-eff = 10,860 +/- 120 K) ZZ Ceti star near the red edge of the instability strip.
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