Computer Science
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cxo..prop.2690m&link_type=abstract
Chandra proposal ID #09408304
Computer Science
Scientific paper
The nearby eclipsing binary VPup has recently been suggested on the basis of eclipse timing residuals to have a third body with a ~5 year orbital period and a mass of ~10 solar masses, but for which there is no spectroscopic evidence, making it the only strong candidate for having a black hole in a wide binary in the Galaxy. At a distance of 300 pc, this object can be studied in great detail, even if it is extremely faint, and is the only black hole candidate with a Hipparcos parallax distance. Past observatories showed variable X-ray emission from this region at a level which was reasonable for Bondi accretion from the stellar wind of the B giant in the VPup. We have recently made ATCA observations of this region and need X-ray observations as well, to compare the two fluxes or upper limits to determine whether it is reasonable for such a flux ratio to come from a stellar mass black hole, and to ensure that the past X-ray emission really is from VPup, rather than a nearby object.
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