Uncovering the CV populatin in M15: a deep, time-resolved, far-UV survey of the cluster core

Details Uncovering the CV populatin in M15: a deep, time-resolved, far-UV survey of the cluster core Uncovering the CV populatin in M15: a deep, time-resolved, far-UV survey of the cluster core

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9792k&link_type=abstract

HST Proposal ID #9792

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Hst Proposal Id #9792 Stellar Populations

Scientific paper

We propose to carry out a deep, far-ultraviolet {FUV}, time-resolved for faint cataclysmic variables {CVs} and other dynamically-formed objects in the globular cluster {GC} M15. We will use the ACS/SBC to carry out 6 epochs of FUV imaging of this cluster in a single filter, and will use two additional visits to obtain images in other FUV and NUV filters. 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 find the CV population in M15, if it exists. In addition, our survey will detect numerous blue stragglers and hot white dwarfs, as well as any other blue objects near the core. Finally, our photometry will yield high-quality FUV light curves of the two low-mass x-ray binaries in M15.

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