A New Age Measurement for Palomar 5

Details A New Age Measurement for Palomar 5 A New Age Measurement for Palomar 5

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.0711m&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #07.11; Bulletin of the American Astronomical Society, Vol. 34, p.1103

Astronomy and Astrophysics

Astronomy

3

Scientific paper

We present a new age measurement for the outer halo globular cluster Palomar 5, derived from HST V and I photometry (Grillmair & Smith 2001, AJ 122:3231). Using α -dependent theoretical isochrones (Bergbusch & VandenBerg 2001, AJ 556:322) and a χ2 minimization process allowing for variations in V-I and age, we explore the possible combinations of cluster age, metallicity, and α -enhancement. We find that, assuming the parameters given in Vandenberg (2000, ApJS 129:315) ((m-M)V=16.85, E(V-I)=0.07, [Fe/H]=-1.41, [α /Fe]=+0.3), the most likely age is 11.5+/-1 Gyr, in agreement with the age derived from ground-based B-V data (VandenBerg 2000). With the same distance modulus and reddening, but substituting the metallicity and α -enhancement measured by high-dispersion Keck spectroscopy ([Fe/H]=-1.3, [α /Fe]=0.2) (Smith et al 2001, AJ 123:1502), we find that the most likely age is still 11.5+/-1 Gyr. This work was supported by NASA through grant GO-06788.01-95A from the Space Telescope Science Institute.

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