Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0139w&link_type=abstract
American Astronomical Society, HEAD meeting #9, #1.39; Bulletin of the American Astronomical Society, Vol. 38, p.335
Other
Scientific paper
We report photometric and spectroscopic observations of HD 109962, a peculiar F2V star. This star undergoes quasi-periodic outbursts about every 350 days. During the most recent outburst, in January 2006, He II 4686 was in emission above the F star continuum with an equivalent width of 2.5 Angstroms. While no other emission was detected above the continuum, a difference spectrum revealed a typical accretion disk emission spectrum. SWIFT and CHANDRA observations about a month after the start of the outburst revealed a weak X-ray source, consistent with emission from the F2V star alone. The previously-reported photometric light curve is that of an ellipsoidal variable with a 0.893 day period. The radial velocity of the F2V primary, however, suggests a slightly non-circular orbit. We will present our observations of the decay of the outburst. We will discuss orbital fits to the light curve and the radial velocities. We suggest that this is a dwarf nova system with a 1.3 solar mass primary and an approximately 1 solar mass white dwarf, perhaps the most massive dwarf nova system currently known.
Bond Howard E.
Walter Frederick M.
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