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Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10183k&link_type=abstract
HST Proposal ID #10183
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Hst Proposal Id #10183 Hot Stars
Scientific paper
We propose to carry out a deep, far-ultraviolet {FUV}, time-resolved survey for cataclysmic variables {CVs} and other dynamically-formed objects in the globular cluster {GC} M80. This will include a search for FUV counterparts to the 17 Chandra sources in our field of view, which include 2 LMXBs and 5 X-ray selected CV candidates. Our goal is to confirm these sources as interacting binaries and find any additional CVs below the Chandra detection limit. We will achieve this with 6 orbits of FUV imaging with the ACS/SB, plus one additional orbit of NUV imaging with ACS/HRC. Since crowding is not a problem in the FUV, this will yield time-resolved FUV photometry of all blue objects in the cluster core. Our CV census will be both deep enough to be essentially complete and ``broad'' enough to involve all of the following CV characteristics: {1} UV brightness; {2} blue FUV spectral shape; {3} strong CIV and HeII emission; {4} short time-scale {sim minutes} variability {flickering, WD spin}; {6} intermediate time-scale {sim hours} variability {orbital variations}; {7} long time-scale {sim weeks} variability {dwarf nova eruptions}. We will thus uncover the interacting binary population in M80. In addition, our survey will detect numerous blue stragglers and hot white dwarfs, as well as any other blue objects in the central regions of this cluster.
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