Deep V, I Photometry for 20 M31 Globular Clusters

Details Deep V, I Photometry for 20 M31 Globular Clusters Deep V, I Photometry for 20 M31 Globular Clusters

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6671r&link_type=abstract

HST Proposal ID #6671

Physics

Hst Proposal Id #6671 Stellar Populations

Scientific paper

We propose deep photometry {to V=27.5} of a sample of 20 M31 globular clusters in the V, I {F555W, F814W} passbands using WFPC2. The main goals of this project are: {1} to determine the dependence of horizontal branch {HB} luminosity on Fe/H, an important constraint on the absolute and relative ages of Galactic globular clusters. {2} to obtain luminosity functions of the clusters and to correlate these with physical properties, especially the brightest giants as a function of Fe/H. {3} to explore the dependence of HB morphology on various parameters {e.g. metallicity, galactocentric distance, concentration, He abundance, etc.} for essential information they may provide on the formation and early evolutionary phases of galaxies, and on the possible impact of environmental conditions on stellar evolution. Structural parameters {core radii, ellipticities, and surface brightness profiles} will be measured and when combined with Keck measurements of velocity dispersions, used to derive M/L for the sample.

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