EXPLORING B4: A PULSATING sdB STAR, IN A BINARY, IN THE OPEN CLUSTER NGC 6791

被引：37
|
作者：
Pablo, Herbert [1 ]
Kawaler, Steven D. [1 ]
Green, Elizabeth M. [2 ]
机构：
[1] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
[2] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 740卷 / 02期
基金：
美国国家航空航天局;
关键词：
binaries: close; open clusters and associations: individual (NGC 6791); stars: horizontal-branch; stars: oscillations; DETACHED ECLIPSING BINARIES; COMPACT PULSATORS; SYNCHRONIZATION TIMES; MAIN-SEQUENCE; SUBDWARF; ASTEROSEISMOLOGY; CIRCULARIZATION; PARAMETERS; EVOLUTION; CURVES;
D O I：
10.1088/2041-8205/740/2/L47
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report on Kepler photometry of the hot subdwarf B (sdB) star B4 in the open cluster NGC 6791. We confirm that B4 is a reflection effect binary with an sdB component and a low-mass main-sequence companion with a circular 0.3985 day orbit. The sdB star is a g-mode pulsator (a V1093 Her star) with periods ranging from 2384 s to 7643 s. Several of the pulsation modes show symmetric splitting by 0.62 mu Hz. Attributing this to rotational splitting, we conclude that the sdB component has a rotation period of approximately 9.63 days, indicating that tidal synchronization has not been achieved in this system. Comparison with theoretical synchronization time provides a discriminant between various theoretical models.
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页数：6
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