The Calibration of the White Dwarf Distance Scale for Globular Clusters

Details The Calibration of the White Dwarf Distance Scale for Globular Clusters The Calibration of the White Dwarf Distance Scale for Globular Clusters

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5439r&link_type=abstract

HST Proposal ID #5439

Mathematics

Logic

Hst Proposal Id #5439 Cool Stars Old Clusters

Scientific paper

Deep WFPC2 UBVI imaging of the nearby Globular Cluster NGC 6752 is proposed in order to use 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. The goal is to obtain the distance modulus of the cluster with an accuracy better than ~ 0.1 mag, thus reducing the uncertainty in cluster ages from the current, cosmologically ambiguous 25% to less than 10%. Four color UBVI photometry of a carefully selected sample of local calibration WDs with trig parallax will allow to construct Fiducial Cooling Sequences (FCS) in the various color-magnitude diagrams. 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.

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