Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8343c&link_type=abstract
HST Proposal ID #8343
Computer Science
Hst Proposal Id #8343 Binary Stars
Scientific paper
Our Cycle 7 STIS UV spectra of AC211, the optical counterpart of the bright X-ray binary X2127+119 in the core of M15, have revealed strong HeII Lambda1648 and CIV Lambda1550 emission together with many broad absorption lines including LyAlpha. The temporal information through primary eclipse will enable us to map the disc and wind of this accretion disc corona source. Recently Homer & Charles {1998} have shown that the 17.1 hr X-ray light curve is stable on long timescales and reveals secondary dip structure around phase 0.5 which we presume to be associated with the disc rim. We are therefore proposing here for additional time-resolved UV spectrophotometry covering phases 0.15-0.7 so as to investigate the complex interaction of the mass transfer stream with the accretion disc. AC211 is optically the most luminous of all the globular cluster X-ray sources and, with its high inclination, is the ideal object for such a study.
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