Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7465b&link_type=abstract
HST Proposal ID #7465
Other
Hst Proposal Id #7465 Stellar Populations
Scientific paper
This program is the complement of our Cycle 4, 5 and 6 programs aimed at using the White Dwarf cooling sequence for the calibration of the globular cluster distance scale. In fact, determination of accurate distances is a critical prerequisite for the estimate of reliable cluster ages. To have fully comparable data sets on the 2 clusters, we apply for deep B data for 47Tuc. This will allow us to mutually fit the WD cooling sequences of the two clusters to one another, thus giving very accurate relative distances {hence ages}. The determination of accurate relative ages for this pair of metal rich/metal poor clusters will provide fundamental evidence on the time scale of the formation of the Galactic halo. In addition, we also need UBVI photometry of a few more local calibrating WDs with accurate absolute magnitudes from trig parallax and/or spectroscopy, to improve upon the White Dwarf Fiducial Cooling Sequences {FCS} that we have started to construct in Cycle 4 and 5. The observed cooling sequences for the clusters is to be fit to the corresponding FCSs to determine accurate cluster distance moduli and absolute ages.
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