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| Query : 2011ApJ...740L..47P |
2011ApJ...740L..47P - Astrophys. J., 740, L47 (2011/October-3)
Exploring B4: a pulsating sdB star, in a binary, in the open cluster NGC 6791.
PABLO H., KAWALER S.D. and GREEN E.M.
Abstract (from CDS):
We report on Kepler photometry of the hot subdwarf B (sdB) star B4 in the open cluster NGC 6791. We confirm that B4 is a reflection effect binary with an sdB component and a low-mass main-sequence companion with a circular 0.3985 day orbit. The sdB star is a g-mode pulsator (a V1093 Her star) with periods ranging from 2384 s to 7643 s. Several of the pulsation modes show symmetric splitting by 0.62 µHz. Attributing this to rotational splitting, we conclude that the sdB component has a rotation period of approximately 9.63 days, indicating that tidal synchronization has not been achieved in this system. Comparison with theoretical synchronization time provides a discriminant between various theoretical models.
Abstract Copyright: ∼
Journal keyword(s): binaries: close - open clusters and associations: individual: NGC 6791 - stars: horizontal-branch - stars: oscillations
Errata: erratum vol. 750, art. 26 (2012)
Simbad objects: 5
| Number of rows : 5 |
| 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 | Feige 11 | HS* | 01 04 21.6747168600 | +04 13 37.054495956 | 10.847 | 11.826 | 12.065 | 12.183 | 12.324 | sdB2VIHe4 | 136 | 0 |
| 2 | Feige 48 | HS* | 11 47 14.4978515760 | +61 15 31.789400364 | 13.12 | 13.28 | sdB | 125 | 0 | |||
| 3 | V* NY Vir | HS* | 13 38 48.1466908176 | -02 01 49.207286748 | 13.43 | 13.66 | 13.75 | sdB1VIIHe1 | 237 | 1 | ||
| 4 | NGC 6791 | OpC | 19 20 52.8 | +37 46 40 | 10.52 | 9.5 | ~ | 1120 | 0 | |||
| 5 | 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 |
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