CCD photometry of the classic second-parameter globular clusters M3 and M13

Soo Chang Rey, Suk Jin Yoon, Young Wook Lee, Brian Chaboyer, Ata Sarajedini

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

We present high-precision V, B-V color-magnitude diagrams (CMDs) for the classic second-parameter globular clusters M3 and M13 from wide-field, deep CCD photometry. The data for the two clusters were obtained during the same photometric nights with the same instrument, allowing us to determine accurate relative ages. Based on a differential comparison of the CMDs using the Δ(B - V) method, an age difference of 1.7 ± 0.7 Gyr is obtained between these two clusters. We compare this result with our updated horizontal-branch (HB) population models, which confirm that the observed age difference can produce the difference in HB morphology between the clusters. This provides further evidence that age is the dominant second parameter that influences HB morphology.

Original languageEnglish
Pages (from-to)3219-3230
Number of pages12
JournalAstronomical Journal
Volume122
Issue number6
DOIs
Publication statusPublished - 2001 Dec

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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