The ACS survey of galactic globular clusters. VII. Relative ages
Marin-Franch, A; Aparicio, Antonio; Piotto, G; Rosenberg, A; Chaboyer, Brian; Sarajedini, A; Siegel, Michael; Anderson, Jay; Bedin, L R; Dotter, Aaron; Hempel, Maren; Milone, Antonino; Paust, Nathaniel; Reid, I Neill
The ACS Survey of Galactic globular clusters is a Hubble Space Telescope Treasury program designed to provide a new large, deep, and homogeneous photometric database. Based on observations from this program, we have measured precise relative ages for a sample of 64 Galactic globular clusters by comparing the relative position of the clusters' main-sequence (MS) turnoffs, using MS fitting to cross-compare clusters within the sample. This method provides relative ages to a formal precision of...[Show more]
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|Source:||Astrophysical Journal Letters|
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