Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7363m&link_type=abstract
HST Proposal ID #7363
Physics
Hst Proposal Id #7363 Binary Stars
Scientific paper
The luminous bursting X-ray sources in globular clusters are exotic in nature { e.g., one has the shortest known binary period of any star}, can greatly influence the dynamical evolution of the cluster, and are the probable progenitors of cluster millisecond radio pulsars. Despite intensive efforts, only three thus far have reported optical counterparts, two due to HST observations. The handful of objects on hand have perplexing, different properties, and few obvious patterns have emerged. Here we discuss our recent discovery with HST of two further globular cluster X-ray source counterparts, in NGC 1851 and NGC 6441, and propose STIS observations to elucidate their nature. The object in NGC 1851 resembles in some ways the two ultrashort period {11 and 21 min} binaries in NGC 6624 and NGC 6712; we suggest observations to learn if 100 luminosity cluster source counterparts fall into this odd category. Our NGC 6441 counterpart more closely resembles the known, higher-luminosity M 15 source, AC 211, thus finally providing more than one example of the class, and allowing an initial observational probe for the underlying explanation of the diversity of properties of these sources.
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