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The globular cluster M 69: color–magnitude diagram and variable stars

Published online by Cambridge University Press:  18 January 2010

M. E. Escobar ,
M. Catelan ,
M. Zoccali ,
H. A. Smith ,
B. J. Pritzl ,
A. Layden ,
J. Gregorsok ,
D. L. Welch  and
T. Webb
M. E. Escobar
Affiliation:
Departamento de Astronomía y Astrofísica, Pontifícia Universidad Católica, Santiago, Chile
M. Catelan
Affiliation:
Departamento de Astronomía y Astrofísica, Pontifícia Universidad Católica, Santiago, Chile
M. Zoccali
Affiliation:
Departamento de Astronomía y Astrofísica, Pontifícia Universidad Católica, Santiago, Chile
H. A. Smith
Affiliation:
Department of Physics and Astronomy, Michigan State University, East Lansing, MI, USA
B. J. Pritzl
Affiliation:
Department of Physics and Astronomy, Macalester College, Saint Paul, MN, USA
A. Layden
Affiliation:
Bowling Green State University, Bowling Green, OH, USA
J. Gregorsok
Affiliation:
Bowling Green State University, Bowling Green, OH, USA
D. L. Welch
Affiliation:
McMaster University, Hamilton, ON, Canada
T. Webb
Affiliation:
Sterrewacht, Leiden University, Leiden, the Netherlands
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Abstract

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We present BV photometry and the results of a search for stellar variability in the Galactic globular cluster M 69. The resulting color–magnitude diagram shows significant contamination by field stars. In our variability search we found 62 variable stars, 54 of which were new discoveries.

Keywords

Hertzsprung–Russell diagramstars: variables: otherglobular clusters: individual (M 69)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S266: Star clusters: basic galactic building blocks throughout time and space , August 2009 , pp. 390
Copyright
Copyright © International Astronomical Union 2010