Variables in Globular Cluster NGC 5024

Abstract

We present the results of a commissioning campaign to observe Galactic globular clusters for the search of microlensing events. The central 10' X 10' region of the globular cluster NGC 5024 was monitored using the 2-m Himalayan Chandra Telescope in R-band for a period of about 8 hours on 24 March 2010. Light curves were obtained for nearly 10,000 stars, using a modified Difference Image Analysis (DIA) technique. We identified all known variables within our field of view and revised periods and status of some previously reported short-period variables. We report about eighty new variable sources and present their equatorial coordinates, periods, light curves and possible types. Out of these, 16 are SX Phe stars, 10 are W UMa-type stars, 14 are probable RR Lyrae stars and 2 are detached eclipsing binaries. Nine of the newly discovered SX Phe stars and two eclipsing binaries belong to the Blue Straggler Star (BSS) population.

29 pages, 22 figures, replaced with rewritten data reduction part

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• Light and Motion in SDSS Stripe 82: The Catalogues
• Deep MMT Transit Survey of the Open Cluster M37 II: Variable Stars
• CCD time-series photometry of the globular cluster NGC 6981: Variable star census and physical parameter estimates
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Cited by in corpus (5)

• RR Lyrae variables in Messier 53: Near-infrared Period--Luminosity relations and the calibration using Gaia Early Data Release 3
• Variable stars in the globular cluster NGC 7492. New discoveries and physical parameters determination
• A detailed census of variable stars in the globular cluster NGC 6333 (M9) from CCD differential photometry
• Investigation of variable star candidates in the globular cluster NGC 5024 (M53)
• A Multiband Photometric Study of RR Lyrae Stars in M53 (NGC 5024)