Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..361e&link_type=abstract
Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #
Physics
Scientific paper
BG Geminorum is an eclipsing binary system, exhibiting an ellipsoidal variation with an optical magnitude of 0.5 mag, and a period of ˜91 days. A K0 supergiant feeds material into an accretion disc surrounding the unseen primary. Existing low resolution spectra have constrained the mass of the primary to be ˜ 3.5 Msun. This primary has been determined to be either a B star, or a black hole. If confirmed to be a black hole, BG Gem would be the the longest period black hole binary system, by an order of magnitude, as well as being the only known eclipsing black hole binary system. One method to confirm the nature of the primary is by acquiring higher quality optical spectra, to determine the maximum rotational velocity of the accretion disc surrounding the primary. ˜700 km / s is the maximum velocity for a disc surrounding a B type star. UV spectra showing a strong continuum, and Si and Mg absorption lines would be indicative of a B star primary. In this poster we present ultraviolet spectra from the Hubble archive, along with the first high resolution optical spectra.
Callanan Paul J.
Elebert Patrick
Russell L.
Shaw Simon E.
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