Discovery of 27 New Variable Stars in the Globular Cluster NGC 6584

Details Discovery of 27 New Variable Stars in the Globular Cluster NGC 6584 Discovery of 27 New Variable Stars in the Globular Cluster NGC 6584

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915120t&link_type=abstract

American Astronomical Society, AAS Meeting #219, #151.20

Astronomy and Astrophysics

Astronomy

Scientific paper

Using the Southeastern Association for Research in Astronomy 0.6 meter telescope located at Cerro Tololo, we searched for variable stars in the globular cluster NGC 6584. We obtained images for 10 nights between 28 May and 6 July of 2011. After processing the images, we used the image subtraction technique developed by Alard (2000) to search for the variable stars. We detected a total of 69 variable stars in our 10x10 arc-minute field, including 42 previously known variables cataloged by Millis & Liller (1980) and 27 hereto undetected variables. In total, we classified 44 as type RRab, with a mean period of 0.56776 days, 16 as type RRc with a mean period of 0.30886 days, 6 eclipsing binaries, and 3 long period (P > 2 days) variable stars. Many of the RR Lyrae stars exhibited the Blazhko Effect. Furthermore, the RR Lyrae stars exhibit a period/amplitude relationship consistent with NGC 6584 being an Oosterhoff Type I cluster. Here we present refined periods, complete multi-color light curves, and classifications for each of the 69 variables, as well Oosterhoff and color-magnitude diagrams for the cluster. 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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