Search for short-period variable stars in the open cluster NGC 2301

Details Search for short-period variable stars in the open cluster NGC 2301 Search for short-period variable stars in the open cluster NGC 2301

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...371..571k&link_type=abstract

Astronomy and Astrophysics, v.371, p.571-578 (2001)

Astronomy and Astrophysics

Astrophysics

16

Open Cluster: Ngc 2301, Stars: C-M Diagrams, Stars: Variables: Gamma Dor, Stars: Binaries: Eclipsing

Scientific paper

Time-series CCD photometric observations of an intermediate age open cluster NGC 2301 were performed to search for variable stars, particularly gamma Dor stars and delta Sct stars. We also carried out UBVI photometry to study physical properties of variable stars in the cluster. We derived observational parameters of the cluster from UBVI photometric results. The best fit of the empirical ZAMS in a color-color diagram gives a reddening value of E(B-V) = 0.05 +/- 0.03. We also estimated a distance modulus of (V-MV)0 = 9.6 +/- 0.1 and an age of log t = 8.4 +/- 0.1, from the ZAMS and isochrone fitting in a color-magnitude diagram. Using V time-series data, we carefully examined light variations of 923 stars fainter than 10\fm0, and discovered nine short-period variable stars; two gamma Dor candidates, five eclipsing binaries, one Slowly Pulsating B star and one magnetic Chemically Peculiar variable candidate. Two gamma Dor candidates with relatively short periods of around 0.3 days are located in a redder region (about 0\fm1 in B-V color) than the red edge of delta Sct instability strip in the color-magnitude diagram.

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