Ultraviolet properties of Galactic globular clusters with GALEX. I. the color-magnitude diagrams

Ricardo P. Schiavon, Emanuele Dalessandro, Sangmo T. Sohn, Robert T. Rood, Robert W. O'Connell, Francesco R. Ferraro, Barbara Lanzoni, Giacomo Beccari, Soo Chang Rey, Jaehyon Rhee, R. Michael Rich, Suk Jin Yoon, Young Wook Lee

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


We present Galaxy Evolution Explorer (GALEX) data for 44 Galactic globular clusters (GCs) obtained during three GALEX observing cycles between 2004 and 2008. This is the largest homogeneous data set on the UV photometric properties of Galactic GCs ever collected. The sample selection and photometric analysis are discussed, and color-magnitude diagrams (CMDs) are presented. The blue and intermediate-blue horizontal branch is the dominant feature of the UV CMDs of old Galactic GCs. Our sample is large enough to display the remarkable variety of horizontal branch shapes found in old stellar populations. Other stellar types that are obviously detected are blue stragglers and post-core-He burning stars. The main features of UV CMDs of Galactic GCs are briefly discussed. We establish the locus of post-core-He burning stars in the UV CMD and present a catalog of candidate asymptotic giant branch (AGB), AGB-manqué, post early-AGB, and post-AGB stars within our cluster sample.

Original languageEnglish
Article number121
JournalAstronomical Journal
Issue number5
Publication statusPublished - 2012 May

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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