The White Dwarf Distance to the Globular Cluster NGC 6752 (and Its Age) with the Hubble Space Telescope

Details The White Dwarf Distance to the Globular Cluster NGC 6752 (and Its Age) with the Hubble Space Telescope The White Dwarf Distance to the Globular Cluster NGC 6752 (and Its Age) with the Hubble Space Telescope

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...465l..23r&link_type=abstract

Astrophysical Journal Letters v.465, p.L23

Astronomy and Astrophysics

Astronomy

127

Galaxy: Globular Clusters: General, Galaxy: Globular Clusters: Individual Ngc Number: Ngc 6752, Cosmology: Distance Scale

Scientific paper

Deep Hubble Space Telescope (HST) observations with WFPC2 of the nearby globular cluster NGC 6752 have allowed us to obtain accurate photometry for the cluster white dwarfs (WDs). A sample of local WDs of known trigonometric parallax and mass close to that of the cluster WDs have also been observed with WFPC2. Matching the cluster and the local WD sequences provides a direct measure of the distance to the cluster: (m - M)0 = 13.05, with an uncertainty less than +/-0.1 mag, which allows a substantial reduction in the uncertainty in the age of the cluster. Indeed, coupling this value of the cluster distance to the cluster metallicity, helium abundance, and alpha -element enhancement [ alpha /Fe] = 0.5 yields an age of 15.5 and 14.5 Gyr using evolutionary models that do not include or do include helium diffusion, respectively. The uncertainty affecting these age determinations is ~10%. The majority of the cluster WDs appear to be of the DA variety, while the color-magnitude location of two WDs is consistent with the DB type. This suggests a cluster DB/DA ratio similar to that of WDs in the solar neighborhood.

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