A Survey for Stellar Variability in the Inner Regions of M3: An application of image subtraction

Details A Survey for Stellar Variability in the Inner Regions of M3: An application of image subtraction A Survey for Stellar Variability in the Inner Regions of M3: An application of image subtraction

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19513206u&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #132.06; Bulletin of the American Astronomical Society, Vol. 32, p.879

Computer Science

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Globular clusters are useful laboratories for the study of extreme stellar dynamical effects in high density environments as well as stellar evolution. Binary stars are dynamically important populations in globulars and even a small change (on the order of a few %) in their relative frequency can dramatically alter the long term evolution of the cluster (Heggie & Aarseth 1992). A census of the short-period binary systems as well as the number of cataclysmic variables in a globular cluster provides important constraints on models of their dynamical evolution. Here we present results from a study for stellar variability in M3 conducted with the MDM 1.3m telescope. The data were processed with the image subtraction technique of Tomaney & Crotts (1996) which allows us to remove the background of non-variable sources, preserving only signals from the relatively few variables. In the inner 1 sq. arcminute, Guhathakurta et al. (1994) discovered 40 variable stars, whereas we have been able to monitor 72 (primarily RR Lyrae) in this same region. We present light curves for our detected variables as well as some upper limits on the detection of cataclysmic variables within the half-mass radius of the cluster. We show that ground-based image subtraction studies can match, if not exceed, the performance of HST and do so in a much more economical manner which suggests the possibility of systematic ground-based surveys of the cores of most Galactic globular clusters.

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