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BIB-VERSION:: AST-PP-v1.0
ID:: epreps.stsci//prep1210
ENTRY:: March 9, 1998
TITLE:: Stellar Populations and Variable Stars in the Core of the Globular Cluster M5
SUBTITLE::
AUTHOR:: Drissen, Laurent (1)
AUTHOR:: Shara, Michael M. (2)
AFFIL:: (1) Département de Physique, Observatoire du Mont Mégantic, Université Laval Ste-Foy, QC, G1K 7P4, Canada
AFFIL:: (2) Space Telescope Science Institute 3700 San Martin Drive Baltimore, MD 21218 USA
DATE:: January 1998
JOURNAL:: Appeared in: The Astronomical Journal, 115:725-733, 1998
SUBMITTED::
ACCEPTED::
OTHER_ACCESS::
COPYRIGHT:: Copyright 1998 The Association of Universities for Research in Astronomy, Inc. All Rights Reserved.
LANGUAGE:: English
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.

END:: epreps.stsci//prep1210