2010MNRAS.408L..51O

Query : 2010MNRAS.408L..51O

2010MNRAS.408L..51O - Mon. Not. R. Astron. Soc., 408, L51-L55 (2010/October-2)

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

OSTENSEN R.H., GREEN E.M., BLOEMEN S., MARSH T.R., LAIRD J.B., MORRIS M., MORIYAMA E., OREIRO R., REED M.D., KAWALER S.D., AERTS C., VUCKOVIC M., DEGROOTE P., TELTING J.H., KJELDSEN H., GILLILAND R.L., CHRISTENSEN-DALSGAARD J., BORUCKI W.J. and KOCH D.

Abstract (from CDS):

2M1938+4603 (KIC9472174) 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 ∼50 to 4500µHz. 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 K1= 65.7±0.6 km/s, inclination angle, and find that the masses of the components are M1= 0.48±0.03 M☉ and M2= 0.12±0.01 M☉.


Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): binaries: close - binaries: eclipsing - stars: individual: 2M1938+4603 - subdwarfs - stars: variables: general

VizieR on-line data: <Available at CDS (J/MNRAS/408/L51): tables1.dat tables2.dat tables3.dat tables4.dat>

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* DW Lyn HS* 07 07 09.7960158264 +60 38 50.159268348   14.7   15.34   sdB 61 1
2 BD-07 3477 HS* 12 44 20.2386233232 -08 40 16.846099536   10.46 10.594 10.895   sdB2VIIHe3 303 1
3 V* NY Vir HS* 13 38 48.1466908176 -02 01 49.207286748   13.43 13.66 13.75   sdB1VIIHe1 237 1
4 PG 1716+426 HS* 17 18 03.8584522800 +42 34 12.562847292   13.69 13.97     sdB2VIIHe3 122 0
5 Kepler-451 HS* 19 38 32.6123816016 +46 03 59.135231952   12.17 12.69 12.46 12.399 sdB+dM 103 0
6 KPD 1946+4340 HS* 19 47 42.8876526504 +43 47 30.754543092 13.05 14.06 14.23 14.92   sdOB+D 62 0

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