Ostensen, R. H., Green, Elizabeth Melton, Bloemen, S., Marsh, T. R., Laird, J. B., Morris, M., Moriyama, E., Oreiro, R., Reed, Michael D., Kawaler, Steven D., Aerts, Conny, Vuckovic, M., Degroote, P., Telting, J. H., Kjeldsen, H., Gilliland, R. L., Christensen-Dalsgaard, Jørgen, 1950-, Borucki, William J. and Koch, D. (David). (2010) 2M1938+4603 : a rich, multimode pulsating sdB star with an eclipsing dM companion observed with Kepler. Monthly Notices of the Royal Astronomical Society, Volume 408 (Number 1). L51-L55. ISSN 0035-8711

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Abstract

2M1938+4603 (KIC 9472174) displays a spectacular light curve dominated by a strong reflection effect and rather shallow, grazing eclipses. The orbital period is 0.126 d, the second longest period yet found for an eclipsing sdB+dM, but still close to the minimum 0.1-d period among such systems. The phase-folded Kepler light curve was used to detrend the orbital effects from the data set. The amplitude spectrum of the residual light curve reveals a rich collection of pulsation peaks spanning frequencies from similar to 50 to 4500 mu Hz. The presence of a complex pulsation spectrum in both the p- and g-mode regions has never before been reported in a compact pulsator.

Eclipsing sdB+dM stars are very rare, with only seven systems known and only one with a pulsating primary. Pulsating stars in eclipsing binaries are especially important since they permit masses derived from seismological model fits to be cross-checked with orbital mass constraints. We present a first analysis of this star based on the Kepler 9.7-d commissioning light curve and extensive ground-based photometry and spectroscopy that allow us to set useful bounds on the system parameters. We derive a radial-velocity amplitude K-1 = 65.7 +/- 0.6 km s(-1), inclination angle i = 69 degrees.45 +/- 0 degrees.20, and find that the masses of the components are M-1 = 0.48 +/- 0.03 M-circle dot and M-2 = 0.12 +/- 0.01 M-circle dot

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Double stars, Eclipsing binaries, Dwarf stars, Variable stars
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Wiley
ISSN:	0035-8711
Official Date:	11 October 2010
Volume:	Volume 408
Number:	Number 1
Number of Pages:	5
Page Range:	L51-L55
Identification Number:	10.1111/j.1745-3933.2010.00926.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	United States. National Aeronautics and Space Administration. Science Mission Directorate (SMD), Seventh Framework Programme (European Commission) (FP7), Katholieke Universiteit te Leuven (1970- )
Grant number:	227224 (FP7), GOA/2008/04 (KUL)
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URI:	http://wrap.warwick.ac.uk/id/eprint/4966

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