White Dwarf Distances to Globular Clusters and the RR Lyrae Luminosity Calibration -- M5.

Details White Dwarf Distances to Globular Clusters and the RR Lyrae Luminosity Calibration -- M5. White Dwarf Distances to Globular Clusters and the RR Lyrae Luminosity Calibration -- M5.

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8310l&link_type=abstract

HST Proposal ID #8310

Computer Science

Hst Proposal Id #8310 Stellar Populations In Clusters

Scientific paper

Despite the efforts of Hipparcos, the RR Lyrae absolute magnitude calibration, M_V{RR}, remains uncertain at a level which critically compromises these stars' use as standard candles. This uncertainty propagates into globular cluster ages, Galactic formation scenarios, limits on the age of the Universe, and estimates of the Hubble Constant. Reviewers have concluded that fitting globular cluster white dwarf {WD} sequences to field WDs with observed trigonometric parallaxes, or to theoretical WD cooling curves, has the potential to provide a precise estimate of M_V{RR}. However, data on WDs in globular clusters are lacking. We propose deep HST WFPC2 imaging in F555W and F814W of the WD sequence in a nearby globular rich in RR Lyrae, NGC 5904 {M5}. We describe our plans for the observations and analysis, and estimate that our resulting M_V{RR} value will be accurate to 0.06 mag {random} plus 0.05 mag {systematic} - more precise than existing methods. We request parallel i maging observations using STIS to detect variable stars in the cluster. We hope to discover and measure periods of eclipsing contact binaries, which will provide an independent distance estimate. We will also derive deep luminosity functions for this intermediate metallicity globular.

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