Computer Science
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cxo..prop.2071w&link_type=abstract
Chandra Proposal ID #07408234, p.1
Computer Science
Chandra Proposal Id #07408234
Scientific paper
HD 109962 (vsnet-alert 8794) is in outburst. It is a 0.89 day W UMa eclipsing binary. It is not a known X-ray source. What makes HD 109962 of interest is that it shows ~0.8 mag outbursts of ~40 day duration about once a year (see http://ar.geocities.com/varsao/NSV_19448.htm). The latest outburst began about 12/26/05. A red spectrum on Jan 13.2 shows a P Cygni H-alpha line, indicative of wind emission. The blue spectrum on Jan 16.2 is astounding. Superposed on a normal F2V spectrum is a large He II 4686 emission line (EW = -2.9 A). He II 4686 requires a source of highly ionizing radiation. It is certainly not normally seen in F2V stars or W UMa systems. The ~periodic nature of the outbursts suggests a model akin to Cir X-1, with a compact object on a highly elliptical orbit that penetrates the wind from the W UMa system. It should be a bright X-ray source during the outburst. If so, followup observations will provide a unique probe of the wind of a contact binary system.
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