The White Dwarf Distance to the Globular Cluster 47 Tucanae and its Age

Details The White Dwarf Distance to the Globular Cluster 47 Tucanae and its Age The White Dwarf Distance to the Globular Cluster 47 Tucanae and its Age

2001-01-26

arxiv.org/abs/astro-ph/0101485v1

Astrophys.J.553:733-743,2001

Astronomy and Astrophysics

Astrophysics

Accepted for publication on the Astrophysical Journal

Scientific paper

10.1086/320980

We present a new determination of the distance (and age) of the Galactic globular cluster 47 Tucanae (NGC 104) based on the fit of its white dwarf (WD) cooling sequence with the empirical fiducial sequence of local WD with known trigonometric parallax, following the method described in Renzini et al. (1996). Both the cluster and the local WDs were imaged with HST+WFPC2 using the same instrument setup. We obtained an apparent distance modulus of $(m-M)_V=13.27\pm0.14$ consistent with previous ground-based determinations and shorter than that found using HIPPARCOS subdwarfs. Coupling our distance determination with a new measure of the apparent magnitude of the main sequence turnoff, based on our HST data, we derive an age of $13\pm2.5$ Gyr.

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