CCD photometry of the old open cluster Collinder 261
Astrophysics
2015-06-24 v1
Abstract
We present UBVI photometry for the old open cluster Collinder 261. From comparison of the observed colour-magnitude diagrams with simulations based on stellar evolutionary models we derive in a self consistent way reddening, distance, and age of the cluster: E(B-V)=0.250.34, (m-M)=11.7-12.0, and age=78 Gyr or 911 Gyr, depending on the adopted stellar tracks. The models in better agreement with the data turn out to have metallicity at most solar.
Keywords
Cite
@article{arxiv.astro-ph/9607081,
title = {CCD photometry of the old open cluster Collinder 261},
author = {E. Gozzoli and M. Tosi and G. Marconi and A. Bragaglia},
journal= {arXiv preprint arXiv:astro-ph/9607081},
year = {2015}
}
Comments
11 pages, plain tex, plus 7 .ps figures, accepted by MNRAS