Using a sample of 43 suitable local subdwarfs with newly acquired BVI photometry, we apply our main sequence fitting method to the metal rich Globular Cluster 47 Tucanae. Fitting in 2 colour planes, we find an apparent distance modulus of (m-M)v = 13.37 (+0.10/-0.11), leading to a dereddened distance modulus of (m-M)o = 13.25 (+0.06/-0.07). Consideration of the Red Clump in the cluster produces a distance modulus fully consistent with this result. The implied cluster age is 11 (+/-1.4) Gyr.
Cite
@article{arxiv.astro-ph/0209074,
title = {Resolving the 47 Tucanae Distance Problem},
author = {Susan M. Percival and Maurizio Salaris and Francois van Wyk and David Kilkenny},
journal= {arXiv preprint arXiv:astro-ph/0209074},
year = {2007}
}
Comments
2 pages, 1 figure. To appear in 'New Horizons in Globular Cluster Astronomy (Padova, June 2002), ASP Conference Series, eds. G. Piotto, G. Meylan, G. Djorgovski and M. Riello