Variable Stars in the Open Cluster NGC 7142

Details Variable Stars in the Open Cluster NGC 7142 Variable Stars in the Open Cluster NGC 7142

2011-10-22

arxiv.org/abs/1110.4931v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

18 figures, accepted to AJ

Scientific paper

We present new discoveries of variable stars near the turnoff of the old open cluster NGC 7142. Contrary to previous studies, we detect eight contact or near contact eclipsing binaries (including three near the cluster turnoff), and most of these have good probability of being cluster members. We also identified one long-period variable that resides far to the red of the cluster giant branch, and four new detached eclipsing binaries. We have re-examined the question of distance and reddening for the cluster, and find that the distance is larger and reddening lower than in most previous studies. In turn this implies that NGC 7142 is probably slightly younger than M67, about 3 Gyr old. With an age of this size, NGC 7142 would be one of a small group of clusters with main sequence turnoff stars at the transition between convective and radiative cores.

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