Exploring B4: A Pulsating sdB star, in a Binary, in the Open Cluster NGC 6791

Details Exploring B4: A Pulsating sdB star, in a Binary, in the Open Cluster NGC 6791 Exploring B4: A Pulsating sdB star, in a Binary, in the Open Cluster NGC 6791

2011-09-16

arxiv.org/abs/1109.3736v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted for publication in ApJ Letters

Scientific paper

We report on Kepler photometry of the hot 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 d 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 microHz. Attributing this to rotational splitting, we conclude that the sdB component has a rotation period of approximately 9.63 d, indicating that tidal synchronization has not been achieved in this system. Comparison with theoretical synchronization time provides a discriminant between various theoretical models.

Affiliated with

Also associated with

No associations

Rating

Exploring B4: A Pulsating sdB star, in a Binary, in the Open Cluster NGC 6791 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Exploring B4: A Pulsating sdB star, in a Binary, in the Open Cluster NGC 6791, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exploring B4: A Pulsating sdB star, in a Binary, in the Open Cluster NGC 6791 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-142180