UV Light from Old Stellar Populations: A Census of UV Bright Stars in `Blue Tail' Globular Clusters

Details UV Light from Old Stellar Populations: A Census of UV Bright Stars in `Blue Tail' Globular Clusters UV Light from Old Stellar Populations: A Census of UV Bright Stars in `Blue Tail' Globular Clusters

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8709f&link_type=abstract

HST Proposal ID #8709

Computer Science

Hst Proposal Id #8709 Hot Stars

Scientific paper

We propose observations of UV-bright stars in 7 Galactic Globular Clusters {GGCs}. These will complement data obtained during Cycles 5 and 6. Our goals are multifold: {a} to observe the morphology in the faint blue tails {BTs} of GGC horizontal branches {HBs}; {b} to explore the relationship between the HB mass distribution in BT clusters to the clusters' structural and dynamical properties; {c} to gain further samples of Blue Straggler Stars and the long-sought Cataclysmic Variables in GGC cores; and {d} to obtain relatively large samples of post main sequence stars. All the targets have a BT which reaches at least to or beyond the turnoff in V; the actual extent can only be determined from the uncrowded UV observations. Our observations will allow a number of studies which cannot be done using ground-based observations: {a} and {b} will indirectly probe the mass loss process close to the tip of the red giant branch {RGB}, which our data {from previous cycles} suggest to be often multimodal; {c} provides a complete survey of these peculiar UV stellar types, along with their radial distributions, will provide fundamental data for internal cluster dynamics. The observations will add to an archive of HST data on GGC's optimized for the study of hot stellar populations. This data set, beyond the study of GGCs, will be fundamental to the understanding of the origin of UV light from elliptical galaxies.

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