HD 109962: the Most Massive Dwarf Nova?

Details HD 109962: the Most Massive Dwarf Nova? HD 109962: the Most Massive Dwarf Nova?

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop...11w&link_type=abstract

XMM-Newton Proposal ID #05004401

Physics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Hd 109962, Xmm-Newton Proposal 05004401

Scientific paper

HD 109962, a bright F2 star and an ellipsoidal variable, is a recently-recognized erupting variable star. Fairly regular outbursts over the past 5 years suggest it is a dwarf nova. Spectra during the Jan 2006 outburst revealed strong He II 4686 emission, and the residual spectrum (outburst - post outburst) is that of an accretion disk. The large mass function suggests a total system mass of about 2.3 solar masses, making this one of the most massive dwarf novae known. The radial velocity curve of the primary suggests either an eccentric orbit or shadowing by an asymmetric disk. Both possibilities are interesting. We propose to observe for one binary orbit (80 ksec) to study the quiescent X-ray emission, study the orbital modulation of the X-ray flux, and look for an X-ray eclipse

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