Variable stars in the open cluster Mel 71

Details Variable stars in the open cluster Mel 71 Variable stars in the open cluster Mel 71

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...348..795k&link_type=abstract

Astronomy and Astrophysics, v.348, p.795-799 (1999)

Astronomy and Astrophysics

Astrophysics

9

Galaxy: Open Clusters And Associations: Individual: Mel 71, Stars: Variables: Delta Sct, Stars: Binaries: Eclipsing

Scientific paper

The UBVI and time-series CCD photometric observations of the intermediate-age open cluster Mel 71 were carried out to search for variable stars and obtain their physical parameters. By fitting the ZAMS to the observed color-color and color-magnitude diagrams, we estimated a reddening value of the cluster E(B-V) = 0.20 +/- 0.05 and a distance modulus (V-M_V)deg = 11.6 +/- 0.2. We also found its age of about log t = 9.0 from an isochrone fitting method for Z = 0.008. Using the observed time-series data, we carefully examined light variations of 358 stars, fainter than 13.0m. Four delta Sct stars and one eclipsing binary were discovered. They are located in the delta Sct instability strip of the color-magnitude diagram. Incidence of variability within the instability strip is about 7%. Newly found delta Sct stars show complex light variations, implying that they have multiple pulsation frequencies. The period of the binary star is estimated to be about 0.678d.

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