Release 11.12 ("Hergest Ridge")

Gclusters :: Bibliographic item "gc441"

Article ID: gc441
AuthorMarĂ­n-Franch, Antonio et al.
TitleThe ACS Survey of Galactic Globular Clusters. VII. Relative Ages
JournalThe Astrophysical Journal, Volume 694, Issue 2, pp. 1498-1516
Year of publication2009 (on gclusters from 2014-01-31 10:47:59 )
AbstractThe 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 2%-7%. We demonstrate that the calculated relative ages are independent of the choice of theoretical model...
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