TY - JOUR
T1 - Ultraviolet properties of Galactic globular clusters with GALEX. I. the color-magnitude diagrams
AU - Schiavon, Ricardo P.
AU - Dalessandro, Emanuele
AU - Sohn, Sangmo T.
AU - Rood, Robert T.
AU - O'Connell, Robert W.
AU - Ferraro, Francesco R.
AU - Lanzoni, Barbara
AU - Beccari, Giacomo
AU - Rey, Soo Chang
AU - Rhee, Jaehyon
AU - Rich, R. Michael
AU - Yoon, Suk Jin
AU - Lee, Young Wook
PY - 2012/5
Y1 - 2012/5
N2 - 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.
AB - 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.
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U2 - 10.1088/0004-6256/143/5/121
DO - 10.1088/0004-6256/143/5/121
M3 - Article
AN - SCOPUS:84859905633
SN - 0004-6256
VL - 143
JO - Astronomical Journal
JF - Astronomical Journal
IS - 5
M1 - 121
ER -