Volume 399, Number 1, February III 2003
|Page(s)||99 - 104|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||05 February 2003|
Search for variable stars in the open cluster NGC 2539
Department of Astronomy and Atmospheric Sciences, Kyungpook National University, Daegu 702-701, Korea
2 Korea Astronomy Observatory, Daejeon 305-348, Korea
3 Department of Astronomy and Space Science, Sejong University, Seoul 143-747, Korea
4 Department of Earth Science, Pusan National University, Busan 609-735, Korea
5 Astronomy Program, SEES, Seoul National University, Seoul 151-742, Korea
Corresponding author: K. J. Choo, firstname.lastname@example.org
Accepted: 7 November 2002
We present UBVI absolute and V-band time-series CCD photometric results for the intermediate-age open cluster NGC 2539. From the empirical zero-age main sequence and theoretical isochrone fitting in color-color and color-magnitude diagrams, we estimated the physical parameters of this cluster as follows: the color excess of , the distance modulus of and the age of (~630 Myr). By carefully examining the time-series images, we discovered seven new variable stars in the observed cluster field. Considering the light curves, periods and positions on the color-magnitude diagram, we classified them as five eclipsing binary stars, one δ Scuti star and one γ Doradus candidate. The γ Doradus candidate might not be a cluster member because it is located redder by about than the cool edge of γ Doradus instability strip.
Key words: open clusters and association: individual: NGC 2539 / stars: Hertzsprung-Russell (HR) and C-M diagrams / stars: binaries: eclipsing
© ESO, 2003
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