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2M1938+4603 : a rich, multimode pulsating sdB star with an eclipsing dM companion observed with Kepler

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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, Borucki, William J. and Koch, D.. (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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Official URL: http://dx.doi.org/10.1111/j.1745-3933.2010.00926.x

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

Dates:

Date	Event
11 October 2010	Published

Volume:

Volume 408

Number:

Number 1

Number of Pages:

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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