Exploring the variable stars in the globular cluster NGC 5024 (M53): new RR Lyrae and SX Phoenicis stars*

A. Arellano Ferro, R. Figuera Jaimes, Sunetra Giridhar, D. M. Bramich, J. V. Hernández Santisteban, K. Kuppuswamy

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

We report CCD V and I time series photometry of the globular cluster NGC 5024 (M53). The technique of difference image analysis has been used which enables photometric precisions better than 10 mmag for stars brighter than V˜ 18.5 mag even in the crowded central regions of the cluster. The high photometric precision has resulted in the discovery of two new RR1 stars and 13 SX Phe stars. A detailed identification chart is given for all the variable stars in the field of our images of the cluster. Periodicities were calculated for all RR Lyrae and SX Phe stars and a critical comparison is made with previous determinations.
Original languageEnglish
Pages (from-to)2265-2284
JournalMonthly Notices of the Royal Astronomical Society
Volume416
Issue number3
DOIs
Publication statusPublished - 1 Sept 2011

Keywords

  • stars: variables: RR Lyrae
  • globular clusters: individual: NGC 5024

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