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Advantages and Drawbacks of the ISM Method in Globular Cluster Photometry

Published online by Cambridge University Press:  12 April 2016

József M. Benkő
József M. Benkő*
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67. H-1525 Budapest, Hungary

Abstract

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In the framework of our survey of variable stars in galactic globular clusters, we tested the promising new photometric technique, the Image Subtraction Method (Alard & Lupton 1998, Alard 2000). We found that the standard deviations of light curves are much better compared to those of the more common PSF methods (e.g. DAOPHOT), especially in the most crowded regions. Moreover, many additional variable stars have become measurable with this method. Unlike previously published data we have transformed our results into conventional magnitudes. The accuracies of the derived magnitudes are discussed.

Type
VII. Science With Small Telescopes
Information
International Astronomical Union Colloquium , Volume 183: Small-Telescope Astronomy on Global Scales , 2001 , pp. 329 - 330
Copyright
Copyright © Astronomical Society of the Pacific 2001

References

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