Other
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9153k&link_type=abstract
HST Proposal ID #9153
Other
Hst Proposal Id #9153 Hot Stars
Scientific paper
We propose to acquire low resolution ultraviolet spectra of the long period black hole binary candidate BG Geminorum. STIS spectra allow an unambiguous test of the nature of the 4.5 M{sun} primary star, which makes no measurable contribution to the optical spectrum. Detection of a strong ultraviolet continuum or ultraviolet absorption lines from Si II and Si III {among others} would indicate a B-type primary; failure to detect these features or detection of {broad} high ionization emission lines would favor a black hole primary. If it contains a black hole, BG Gem would be the longest period black hole binary known {by a factor of ten}, challenging current theories of black hole formation. It would also be the only eclipsing binary known to contain a black hole, which would provide a unique laboratory for testing accretion disk models for black hole binary systems.
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