New Variable Stars in Open Clusters I: Methods and Results for 20 Open Clusters

Details New Variable Stars in Open Clusters I: Methods and Results for 20 Open Clusters New Variable Stars in Open Clusters I: Methods and Results for 20 Open Clusters

2004-02-17

arxiv.org/abs/astro-ph/0402398v1

Astron.Astrophys. 418 (2004) 99-102

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, accepted by A&A

Scientific paper

10.1051/0004-6361:20035624

We present high precision CCD photometry of 1791 objects in 20 open clusters with an age from 10 Myr to 1 Gyr. These observations were performed within the Delta a photometric system which is primarily used to detect chemically peculiar stars of the upper main sequence. Time bases range between 30 minutes and up to 60 days with data from several nights. We describe the way of time series analysis reaching a detection limit of down to 0.006 mag. In total, we have detected 35 variable objects from which four are not members of their corresponding clusters. The variables cover the entire Hertzsprung-Russell-diagram, hence they are interesting targets for follow-up observations.

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