Journal Article

Variable stars in the globular cluster M5: application of the image subtraction method

A. Olech, P. R. Woźniak, C. Alard, J. Kaluzny and I. B. Thompson

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 310, issue 3, pages 759-764
Published in print December 1999 | ISSN: 0035-8711
Published online December 1999 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1046/j.1365-8711.1999.02991.x
Variable stars in the globular cluster M5: application of the image subtraction method

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Abstract

We present V-band light curves of 61 variables from the core of the globular cluster M5 obtained using a newly developed image subtraction method (ISM). Four of these variables were previously unknown. Only 26 variables were found in the same field using photometry obtained with dophot software. Fourier parameters of the ISM light curves have relative errors up to 11 times smaller than parameters measured from dophot photometry. We conclude that the new method is very promising for searching for variable stars in the cores of the globular clusters and gives very accurate relative photometry with quality comparable to photometry obtained by the Hubble Space Telescope. We also show that the variable V104 is not an eclipsing star as has been suggested, but is an RRc star showing non-radial pulsations.

Keywords: stars: variables: other; globular clusters: individual: M5

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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