GALEX Color Magnitude Diagrams for 40 Galactic Globular Clusters

Details GALEX Color Magnitude Diagrams for 40 Galactic Globular Clusters GALEX Color Magnitude Diagrams for 40 Galactic Globular Clusters

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21923002s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #230.02

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Scientific paper

We present GALEX color-magnitude diagrams (CMDs) for 40 Galactic globular clusters obtained during 3 GALEX observing cycles between 2004 and 2008. This is the largest homogeneous data set ever collected on the ultra-violet (UV) photometric properties of Galactic globular clusters. We show that the horizontal branch (HB) is the dominant feature of the UV CMDs of old Galactic globular clusters. The sample spans a wide range of metallicity and HB morphology, displaying the remarkable variety of HB shapes found in old stellar populations. Blue stragglers and post core-He burning stars are other stellar types detected in our photometry. The locus in the UV CMDs of the rare post core-He burning stars in globular clusters is established. This is a legacy data set that we expect will help promoting further understanding of the evolution of low-mass stars after the Helium flash.

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