Variable stars in the open cluster NGC 6791 and its surrounding field

Details Variable stars in the open cluster NGC 6791 and its surrounding field Variable stars in the open cluster NGC 6791 and its surrounding field

2007-06-20

arxiv.org/abs/0706.2962v1

Astronomy and Astrophysics

Astrophysics

24 pages, 19 Figures, A&A accepted

Scientific paper

10.1051/0004-6361:20077386

Aims: This work presents a high--precision variability survey in the field of the old, super metal-rich open cluster NGC 6791. Methods: The data sample consists of more than 75,000 high-precision CCD time series measurements in the V band obtained mainly at the Canada-France-Hawaii Telescope, with additional data from S. Pedro Martir and Loiano observatories, over a time span of ten nights. The field covers an area of 42x28 arcmin^2. Results: We have discovered 260 new variables and re-determined periods and amplitudes of 70 known variable stars. By means of a photometric evaluation of the membership in NGC 6791, and a preliminary membership based on the proper motions, we give a full description of the variable content of the cluster and surrounding field in the range 16

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