White Dwarf Distance and Precision Age for the Globular Cluster 47 TUC

Details White Dwarf Distance and Precision Age for the Globular Cluster 47 TUC White Dwarf Distance and Precision Age for the Globular Cluster 47 TUC

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6114r&link_type=abstract

HST Proposal ID #6114

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Hst Proposal Id #6114 Stellar Populations

Scientific paper

This is the natural continuation of our Cycle 4 program aimed at using the White Dwarf cooling sequence for the calibration of the globular cluster distance scale, the determination of accurate distances being a prerequisite for the estimate of reliable cluster ages. Cycle 4 observations have just begun; they will deal with the metal poor cluster NGC 6752. Now the goal is to use the same method to obtain the distance modulus of the metal rich cluster 47 Tuc, with an accuracy better than ~ 0.1 mag, which allows a 10 Besides allowing a more stringent determination of the age of the galactic globular cluster system, the comparison between the age of the two clusters will test whether there really exists a measurable age difference between the metal poor and the metal rich clusters, as has been inferred from some horizontal branch luminosity-metallicity calibration. Besides deep WFPC2 UBVI imaging of 47 Tuc, we also need UBVI photometry of a few local calibration WDs with trig parallax, so as to improve upon the White Dwarf Fiducial Cooling Sequences (FCS) that we have started to construct in Cycle 4. The observed cooling sequences for the cluster (separately for DA and non-DA WDs) will then be fit to the corresponding FCSs to determine the cluster distance modulus. Moreover, directly fitting to each other the WD cooling sequences of the two clusters will allow a very accurate relative distance (hence age

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