Mathematics – Logic
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3726f&link_type=abstract
HST Proposal ID #3726
Mathematics
Logic
Hst Proposal Id #3726
Scientific paper
The original aim of this proposal was to observe 27 globular clusters in M31 using FOC/96 over a period of three years with the following scientific rationale: a) during cycle 2 and 3, B and UV images in order to obtain surface brightness profiles and blue upper parts of CMDs (e.g. Post-AGB and blue HB stars). This is essential for understanding the dynamical properties of the clusters and the galaxy, and the stellar population characteristics also in comparison with other LG galaxies (MW, MCs). 13 clusters are planned to be observed in cycle 1 in B and surface brightness profiles have been obtained. b) On the assumption that in cycle 4 HST is restored to its original optical performance, we proposed to observe 10 top-priority clusters using B and V filters, in order to obtain accurate (0.1 mag) CMDs down to the HB level. This would allow to derive the slope of the HB luminosity vs metallicity relation, a key ingredient in globular cluster distance and age determinations, with well known cosmological implications. Within this framework, the TAC has recommended that the time allocated to this proposal (2.5hrs) be used to observe one cluster in two filters during cycle 2, in order to test the feasibility and obtain the blue upper part of the CMD (i.e. UV-bright, Post-AGB and blue HB stars).
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