An Ultraviolet Census of Counterparts to Highly Luminous X-ray Sources in M31 Globular Clusters

Details An Ultraviolet Census of Counterparts to Highly Luminous X-ray Sources in M31 Globular Clusters An Ultraviolet Census of Counterparts to Highly Luminous X-ray Sources in M31 Globular Clusters

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8211m&link_type=abstract

HST Proposal ID #8211

Physics

Hst Proposal Id #8211 Binary Stars

Scientific paper

The cores of certain globular clusters in our Galaxy contain some of the most extraordinary stars known, identified by their intense, near-Eddington limited X-ray emission. Essentially all are X-ray bursters, emitting L_x>10^4 L_odot in a few seconds. At least one, and probably two, of these sources are the shortest binary period stars known anywhere: NGC 6624 contains a double-degenerate binary with an 11 minute orbital period. HST has enabled the optical identification and study of counterparts to a half-dozen of these sources in the Milky Way, but the systems prove to have a wide range of optical luminosities and orbital periods, with few obvious patterns emerging. However, one common characteristic of these sources is intense flux at 1400 Angstrom, a wavelength where the 10^5 cluster stars virtually disappear. The Andromeda Nebula is known to contain dozens of bright globular cluster X-ray sources. We propose here a modest, first imaging reconnaissance of globular cluster X-ray source counterparts in M 31 at 1400 Angstrom, with a goal of materially increasing the number of X-ray clusters with counterparts, and further exploring an odd dispersion of L_X/L_1400 seen in galactic clusters.

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