期刊
ASTRONOMY & ASTROPHYSICS
卷 525, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201015729
关键词
techniques: radial velocities; stars: early-type; white dwarfs; blue stragglers; binaries: eclipsing; planets and satellites: general
资金
- Centre National d'Etudes Spatiales (CNES)
- Swiss National Science Foundation [PA00P2_126150/1]
- Fundacao para a Ciencia e a Tecnologia (FCT), Portugal [PTDC/CTE-AST/66643/2006, PTDC/CTE-AST/098528/2008]
- FCT/MCTES (Portugal)
- POPH/FSE (EC)
- European Research Council/European Community
The Kepler mission has detected transits and occultations of a hot compact object around an early-type star, the Kepler Object of Interest KOI 74. The mass of this transiting object was photometrically assessed in a previous study using the presence of the relativistic beaming effect (so-called Doppler boosting) in the light curve. Our aim was to provide a spectroscopic validation of this pioneering approach. We measured the radial velocity variations of the A1V star KOI 74 with the SOPHIE spectrograph at the 1.93-m telescope of the Observatoire de Haute-Provence (France). Radial velocity measurements of this star are challenging because of the high level of stellar pulsations and the few available spectral lines. Using a technique dedicated to early-type main-sequence stars, we measured radial velocity variations compatible with a companion of mass 0.252 +/- 0.025 M(circle dot), in good agreement with the value derived from the Kepler light curve. This work strengthens the scenario suggesting that KOI 74 is a blue straggler orbited by a stellar core despoiled of its envelope, the low-mass white dwarf KOI 74b.
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