Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7287s&link_type=abstract
HST Proposal ID #7287
Other
Hst Proposal Id #7287 Binary Stars
Scientific paper
A few very close binaries in the core of a globular cluster can drive the dynamical evolution of the 10^5 - 10^6 stars in the cluster. Tidal capture theory predicts that tens of cataclysmic variables should be present in most globulars. Thus these close binaries may be the engines which drive globular cluster dynamical evolution. Despite intensive searches, very few cataclysmic candidates have been sighted - only two are classical novae. Using WFPC2 imagery we have located a UV-bright candidate which coincides with the position of the classical nova T Sco which erupted in 1860 A.D. in the globular cluster M80. Only one other UV-bright star {out of 8000 in the cluster core} was found. We propose to use the long slit of STIS with the modest resolution G430L grating to simultaneously obtain spectra of both UV-bright stars. This would provide the first confirmed, recovered old nova in a globular; the first spectrum of a high mass transfer rate binary in a globular core; and a determination of whether the second UV-bright object is also a cataclysmic binary. We also propose to recover the nova of 1938 in M14 with F336W and F555W Planetary Camera images.
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