Journal Article

Investigation of variable star candidates in the globular cluster NGC 5024 (M53)

D. M. Bramich, A. Arellano Ferro, R. Figuera Jaimes and Sunetra Giridhar

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 424, issue 4, pages 2722-2732
Published in print August 2012 | ISSN: 0035-8711
Published online August 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21360.x
Investigation of variable star candidates in the globular cluster NGC 5024 (M53)

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Abstract

We have performed a careful investigation of the 74 candidate variable stars presented by Safonova & Stalin. For this purpose we used our data base of imaging and light curves from Arellano Ferro et al. We find that two candidates are known variable stars, eight candidates were discovered first by Arellano Ferro et al., but would not have been known to Safonova & Stalin at the time of their paper submission, while four candidates are new variables. Three of the new variables are SX Phe type and one is a semiregular (SR) type red giant variable. We also tentatively confirm the presence of true variability in two other candidates, and we are unable to investigate another four candidates because they are not in our data base. However, we find that the remaining 54 candidate variable stars are spurious detections where systematic trends in the light curves have been mistaken for true variability. We believe that the erroneous detections are caused by the adoption of a very low detection threshold used to identify these candidates.

Keywords: stars: variables: general; globular clusters: individual: NGC 5024

Journal Article.  6338 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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