Abstract
We have undertaken a long-term project, Planets in Stellar Clusters Extensive Search (PISCES), to search for transiting planets in open clusters. NGC 2158 is one of the targets we have chosen - an intermediate age, populous, rather metal-poor cluster. In this paper we present the results of a search for variable stars in the data from the first season of monitoring at the FLWO 1.2 m telescope. This is the first variability search ever conducted in this cluster. We present a catalog of 57 variable stars, most with low-amplitude variability. Among the variables is a cataclysmic variable (CV) that underwent a 2.5 mag outburst. If it is a member of NGC 2158, this would be the fourth CV known in an open cluster. We have also found five 6 Scuti stars, three of which have two or more detectable modes of pulsation. Of the 57 variables discovered, 28 have R-band amplitudes of 5% or below. Six of those vary at or below the 2% level, including one with 0.08% variability.
Original language | English (US) |
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Pages (from-to) | 312-322 |
Number of pages | 11 |
Journal | Astronomical Journal |
Volume | 128 |
Issue number | 1 1783 |
DOIs | |
State | Published - Jul 2004 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
Keywords
- Binaries: eclipsing
- Hertzsprung-russell diagram
- Novae, cataclysmic variables
- δ scuti