Origin of the hard X-ray emission in Gamma Cas analogs: HD 110432

Details Origin of the hard X-ray emission in Gamma Cas analogs: HD 110432 Origin of the hard X-ray emission in Gamma Cas analogs: HD 110432

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop..175m&link_type=abstract

XMM-Newton Proposal ID #05047301

Physics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Hd 110432, Xmm-Newton Proposal 05047301

Scientific paper

A small group of early Be stars (the class of Gamma Cas analogs) exhibit low luminosity hard X-ray emission with Log(Lx) ~ 32-33 erg/s. Both a white dwarf accreting from the circumstellar disc or magnetic interaction between the photosphere and the disc can explain the unusually hard X-ray emission. The target of the proposal, HD 110432, is after Gamma Cas itself, the X-ray brightest member of this group and furthermore displays more marked characteristics of this class than the prototype. We propose to obtain a RGS spectrum of HD 110432 in order to constrain the X-ray emission mechanism using emission line disgnostics, investigate the effect of a different disc inclination, search for abundances anomalies and look for stable periodicities.

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