期刊
ASTROPHYSICAL JOURNAL
卷 805, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/805/2/94
关键词
stars: horizontal-branch; stars: individual (KIC 3527751); stars: oscillations; stars: rotation; subdwarfs
资金
- National Science Foundation grant [1009436, 1312869]
- Missouri Space Grant Consortium - NASA
- Polish National Science Center [UMO-2011/03/D/ST9/01914]
- NASA [NAS5-26555]
- NASA Office of Space Science [NNX13AC07G]
- NASA Science Mission directorate
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1312869] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009436] Funding Source: National Science Foundation
We analyze 3 yr of nearly continuous Kepler spacecraft short cadence observations of the pulsating subdwarf B (sdB) star KIC 3527751. We detect a total of 251 periodicities, most in the g-mode domain, but some where p-modes occur, confirming that KIC 3527751 is a hybrid pulsator. We apply seismic tools to the periodicities to characterize the properties of KIC 3527751. Techniques to identify modes include asymptotic period spacing relationships, frequency multiplets, and the separation of multiplet splittings. These techniques allow for 189 (75%) of the 251 periods to be associated with pulsation modes. Included in these are three sets of l = 4 multiplets and possibly an l = 9 multiplet. Period spacing sequences indicate l = 1 and 2 overtone spacings of 266.4 +/- 0.2 and 153.2 +/- 0.2 s, respectively. We also calculate reduced periods, from which we find evidence of trapped pulsations. Such mode trappings can be used to constrain the core/atmosphere transition layers. Interestingly, frequency multiplets in the g-mode region, which sample deep into the star, indicate a rotation period of 42.6 +/- 3.4 days while p-mode multiplets, which sample the outer envelope, indicate a rotation period of 15.3 +/- 0.7 days. We interpret this as differential rotation in the radial direction with the core rotating more slowly. This is the first example of differential rotation for a sdB star.
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