Journal
ASTRONOMY & ASTROPHYSICS
Volume 421, Issue 2, Pages 667-672Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20035944
Keywords
galaxy : globular clusters : individual : NGC 2808; stars : horizontal-branch; stars : variables : RR Lyr
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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 78 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.
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