Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5903f&link_type=abstract
HST Proposal ID #5903
Physics
Hst Proposal Id #5903 Stellar Populations
Scientific paper
We have been allocated telescope time to study two globular clusters in optical and UV filters. The clusters, M80 and M13, have blue horizontal-branch (HB) tails extending to V magnitudes equal to or fainter than the main sequence turnoff. The WFPC2 will be used to image the central regions of these clusters in far-UV, mid-UV and near UV broadband filters, and in the V filter to provide a longer baseline. The object of this investigation is twofold: (a) to explore the HB mass distribution in clusters with blue HB tails (BT clusters) and investigate the relationship between the HB mass distribution and the clusters' structural and dynamical properties and (b) to gain further samples of blue straggler stars (BS) in the cores of such clusters. These observations will indiecrtly probe the mass loss process close to the tip of the red giant branch. The bluest stars to be observed are also very similar to the stars that are probably responsible for the UV upturn in elliptical galaxies. The clusters to be observed have different surface brightness profiles but very similar HB morphology. The near- and mid-UV images will be able to detect blue stragglers in the cluster cores, the production of which is also likely to be related to dynamical processes within the clusters.
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