XMM-Newton Proposal 02012601

Details XMM-Newton Proposal 02012601 XMM-Newton Proposal 02012601

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003xmm..prop...69s&link_type=abstract

XMM-Newton Proposal ID #02012601

Physics

Hd 110432, Xmm-Newton Proposal 02012601

Scientific paper

HD 110432 is a variable hard X-ray source which has been suggested to be wind-fed Be binary, but it is perhaps more likely to be an analog of the enigmatic X-ray Be star gamma Cas. The discovery of an analog to gamma Cas would establish the existence of a small but new important class of single X-ray Be stars. We propose to obtain RGS and EPIC spectra of this source to address this question. Thanks to a Chandra investigation, we now know what a "gamma Cas" spectrum looks like: a strong ~11 keV continuum which is attenuated at long wavelengths,Fe K lines, a broad DEM extending to H and He-like ions radiating down to only 1 MK, collisional signatures, and moderate Fe K fluoresence. Among hot stars, this is so far unique enough to serve as a prototype for a new class of X-ray spectrum.

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