期刊
ASTRONOMY & ASTROPHYSICS
卷 569, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201423611
关键词
subdwarfs; binaries: close; stars: oscillations; stars: individual: KIC 10553698
资金
- NASA Science Mission Directorate
- European Research Council under the European Community [227224]
- Research Council of KU Leuven grant [GOA/2008/04]
- US National Science Foundation grants [1009436, 1312869]
- Polish National Science Centre [UMO-2011/03/D/ST9/01914]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009436, 1312869] Funding Source: National Science Foundation
The subdwarf-B pulsator, KIC 10553698A, is one of 16 such objects observed with a one-minute sampling rate for most of the duration of the Kepler mission. Like most of these stars, it displays a rich g-mode pulsation spectrum with several clear multiplets that maintain regular frequency splitting. We identify these pulsation modes as components of rotationally split multiplets in a star rotating with a period of similar to 41 d. From 162 clearly significant periodicities, we are able to identify 156 as likely components of l = 1 or l = 2 multiplets. For the first time we are able to detect l = 1 modes that interpose in the asymptotic period sequences and that provide a clear indication of mode trapping in a stratified envelope, as predicted by theoretical models. A clear signal is also present in the Kepler photometry at 3.387 d. Spectroscopic observations reveal a radial-velocity amplitude of 64.8 kms(-1). We find that the radial-velocity variations and the photometric signal have phase and amplitude that are perfectly consistent with a Doppler-beaming effect and conclude that the unseen companion, KIC10553698B, must be a white dwarf most likely with a mass close to 0.6 M-circle dot.
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