Stellar Populations and Variable Stars in the Core of the Globular Cluster M5
Astrophysics
2009-10-30 v1
Abstract
We report the discovery of a variable blue straggler in the core of the globular cluster M5, based on a 12-hour long series of images obtained with the Planetary Camera aboard the Hubble Space Telescope. In addition, we present the light curves of 28 previously unknown or poorly studied large-amplitude variable stars (all but one are RR Lyrae) in the cluster core. A (V, U-I) color-magnitude diagram shows 24 blue stragglers within 2 core radii of the cluster center. The blue straggler population is significantly more centrally concentrated than the horizontal branch and red giant stars.
Keywords
Cite
@article{arxiv.astro-ph/9711152,
title = {Stellar Populations and Variable Stars in the Core of the Globular Cluster M5},
author = {L. Drissen and M. M. Shara},
journal= {arXiv preprint arXiv:astro-ph/9711152},
year = {2009}
}
Comments
22 pages, 18 postscript figures, 1 postscript table, AJ, in press (Feb 1998)