Search for variable stars in the open cluster NGC 2539

Details Search for variable stars in the open cluster NGC 2539 Search for variable stars in the open cluster NGC 2539

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...399...99c&link_type=abstract

Astronomy and Astrophysics, v.399, p.99-104 (2003)

Astronomy and Astrophysics

Astrophysics

4

Open Clusters And Association: Individual: Ngc 2539, Stars: Hertzsprung-Russell (Hr) And C-M Diagrams -, Stars: Binaries: Eclipsing

Scientific paper

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 E(B-V)=0.06 +/- 0.03, the distance modulus of (V-MV)0=10.2 +/- 0.1 and the age of log t = 8.8 ( ~ 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 delta Scuti star and one gamma Doradus candidate. The gamma Doradus candidate might not be a cluster member because it is located redder by about Delta (B-V) = 0.2 than the cool edge of gamma Doradus instability strip.

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