Multicolour CCD photometry of the variable stars in globular cluster M3

J. M. Benko, G. Á Bakos, J. Nuspl

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

We present time-series data on the variable stars of the galactic globular cluster Messier 3 (M3). We give BVIc light curves for 226 RR Lyrae, 2 SX Phe and l W Vir type variables, along with estimated fundamental photometric parameters such as intensity and magnitude-averaged brightness and pulsation periods. In some cases, the periods we have found significantly differ from the previously published ones. This is the first published light curve and period determination for variable V266. The I-band light curve has not been observed previously for numerous (76) variables. Three new RR Lyrae variables have been discovered. Groups of RR Lyrae variables that belong to different evolutionary stages and have been separated previously on the basis of V data were found here for all colours and colour indices by cluster analysis. The /-band period-luminosity relation is also discussed. From the 66 modulated (Blazhko type) RR Lyrae stars we investigated, six are newly identified and two of them are first overtone pulsators. In the case of 13 RR Lyrae, the period of Blazhko cycle has been estimated for the first time. V252 is identified as a new RRd variable. Amplitude ratios of RRd stars have been investigated to search possible mode content changes. In contrast to previous publications no changes have been found. Problems with the sampling of the time-series of typical cluster variability surveys are demonstrated.

Original languageEnglish
Pages (from-to)1657-1674
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume372
Issue number4
DOIs
Publication statusPublished - Nov 1 2006

Keywords

  • Stars: individual: RR Lyrae
  • Stars: variables: other globular clusters: individual: M3
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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