2012MNRAS.422.1343P

Query : 2012MNRAS.422.1343P

2012MNRAS.422.1343P - Mon. Not. R. Astron. Soc., 422, 1343-1351 (2012/May-2)

Seismic evidence for non-synchronization in two close sdb+dM binaries from Kepler photometry.

PABLO H., KAWALER S.D., REED M.D., BLOEMEN S., CHARPINET S., HU H., TELTING J., OSTENSEN R.H., BARAN A.S., GREEN E.M., HERMES J.J., BARCLAY T., O'TOOLE S.J., MULLALLY F., KURTZ D.W., CHRISTENSEN-DALSGAARD J., CALDWELL D.A., CHRISTIANSEN J.L. and KINEMUCHI K.

Abstract (from CDS):

We report on extended photometry of two pulsating subdwarf B (sdB) stars in close binaries. For both cases, we use rotational splitting of the pulsation frequencies to show that the sdB component rotates much too slowly to be in synchronous rotation. We use a theory of tidal interaction in binary stars to place limits on the mass ratios that are independent of estimates based on the radial velocity curves. The companions have masses below 0.26 M☉. The pulsation spectra show the signature of high-overtone g-mode pulsation. One star, KIC 11179657, has a clear sequence of g modes with equal period spacings as well as several periodicities that depart from that trend. KIC 02991403 shows a similar sequence, but has many more modes that do not fit the simple pattern.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): binaries: close - stars: horizontal branch - stars: oscillations - stars: rotation - subdwarfs

Simbad objects: 4

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Number of rows : 4
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 GALEX J190221.9+485052 HS* 19 02 21.9425643552 +48 50 52.195229160   17.1   17.1   sdB+dM 36 0
2 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
3 Cl* NGC 6791 KU B4 HS* 19 21 12.8916906768 +37 45 51.138205956 16.73 17.69 17.873 17.910 18.02 sdB 46 0
4 SDSS J192715.88+380808.2 HS* 19 27 15.8823018024 +38 08 08.280985956   16.3   16.9   sdB+dM 30 0

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