This article has an erratum: [erratum]
Volume 421, Number 2, July II 2004
|Page(s)||667 - 672|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||22 June 2004|
Discovery of a variable star population in NGC 2808
Department of Physics, University of North Carolina at Charlotte, Charlotte, NC 28223, USA e-mail: firstname.lastname@example.org
2 Pontificia Universidad Católica de Chile, Departamento de Astronomía y Astrofísica, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile e-mail: [mcatelan;jborisso]@astro.puc.cl
3 Dept. of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA e-mail: email@example.com
Corresponding author: M. Catelan, firstname.lastname@example.org
Accepted: 14 April 2004
We have applied the image subtraction method to images of the peculiar, bimodal-horizontal branch globular cluster NGC 2808, taken over a total of six nights over a range of five months. As a result, we have found, for the first time, a sizeable population of variable stars in the crowded inner regions of the cluster, thus raising the known RR Lyrae population in the cluster to a total of 18 stars. In addition, an eclipsing binary and two other variables with periods longer than 1 day were also found. Periods, positions and (differential) light curves are provided for all the detected variables. The Oosterhoff classification of NGC 2808, which has recently been associated with a previously unknown dwarf galaxy in Canis Major, is briefly discussed.
Key words: Galaxy: globular clusters: individual: NGC 2808 / stars: horizontal-branch / stars: variables: RR Lyr
© ESO, 2004
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