Journal Article

Optical photometric study of the open clusters Koposov 12, Koposov 53 and Koposov 77

R. K. S. Yadav, E. V. Glushkhova, Devesh Path Sariya, A. V. Porokhova, Brijesh Kumar and Ram Sagar

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 414, issue 1, pages 652-658
Published in print June 2011 | ISSN: 0035-8711
Published online June 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18430.x
Optical photometric study of the open clusters Koposov 12, Koposov 53 and Koposov 77

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We present UBVI CCD photometry in the region of the open clusters Koposov 12, Koposov 53 and Koposov 77. The optical CCD data for these clusters are obtained for the first time. The radii are found to be 4.6, 4.2 and 2.4 arcmin. The reddenings E(BV) are 0.51 ± 0.05, 0.41 ± 0.05 and 0.56 ± 0.05 mag for Koposov 12, Koposov 53 and Koposov 77, respectively, while the corresponding distances are 2.0 ± 0.2, 5.3 ± 0.5 and 5.4 ± 0.5 kpc. Comparison with Z= 0.008 isochrones leads to an age of 0.6 ± 0.2 Gyr for Koposov 12. Ages of 89 ± 10 Myr for Koposov 53 and 1.2 ± 0.3 Gyr for Koposov 77 are determined using the isochrones of Z= 0.019. Our analysis shows that the reddening law is normal towards the clusters under study.

Keywords: stars: evolution; stars: Hertzsprung–Russell and colour–magnitude diagrams; open clusters and associations: individual: Koposov 12; open clusters and associations: individual: Koposov 53; open clusters and associations: individual: Koposov 77; galaxies: star clusters: general

Journal Article.  4331 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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