Discovery of 6 SX Phoenicis Stars in the Globular Cluster NGC 4833

Details Discovery of 6 SX Phoenicis Stars in the Globular Cluster NGC 4833 Discovery of 6 SX Phoenicis Stars in the Globular Cluster NGC 4833

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915119m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #151.19

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the discovery of 6 SX Phoenicis stars in the globular cluster NGC 4833. Images were obtained from January through June 2011 with the Southeastern Association for Research in Astronomy (SARA) 0.6 meter telescope located at Cerro Tololo Interamerican Observatory. The image subtraction method of Alard & Lupton (1998) was used to search for variable stars in the cluster. We confirmed 16 previously known variables cataloged by Demers & Wehlau (1977). In addition to the previously known variables we have identified 11 new variables. Of the total number of confirmed variables in our 10x10 arc minute field, we classified 10 RRab variables, with a mean period of 0.69591 days, 9 RRc, with a mean period of 0.39555 days, a W Ursae Majoris contact binary, an Algol-type binary, and the 6 SX Phoenicis stars with a mean period of 0.05847 days. The periods and relative numbers of RRab and RRc variables are indicative of the cluster being of the Oosterhoff type II. We present the periods of previously known variables and the periods, classification, and multi-color light curves of the newly discovered variables, and their location on the color-magnitude diagram. This project was funded in part by the National Science Foundation Research Experiences for Undergraduates (REU) program through grant NSF AST-1004 872 and by a grant from the Butler Institute for Research and Scholarship.

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