XMM-Newton observations of low luminosity Be/X-ray candidates

Details XMM-Newton observations of low luminosity Be/X-ray candidates XMM-Newton observations of low luminosity Be/X-ray candidates

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006adspr..38.2782l&link_type=abstract

Advances in Space Research, Volume 38, Issue 12, p. 2782-2784.

Computer Science

1

Scientific paper

A small number of early Be stars exhibit X-ray luminosities intermediate between those typical of early type stars and those radiated by Be/X-ray binaries in the quiescent state. We report on XMM-Newton observations of two such Be stars, HD 161103 and SAO 49725 which were originally discovered in a systematic cross-correlation between the ROSAT all-sky survey and SIMBAD. The new observations confirm the X-ray luminosity detected by ROSAT (LX ˜ 1032 erg s-1) and the hardness of their X-ray spectra (thin thermal with kT ˜ 8 10 keV or power law with photon index of ˜1.7) which are both unusual for normal early type stars. We discuss the possible origin of this excess X-ray emission in the light of the models proposed for γ-Cas, magnetic disc-star interaction or accretion onto a compact companion object, neutron star or white dwarf, and compare the properties of these two sources with those of the new massive systems discovered in the XMM- Newton/SSC survey of the Galactic plane.

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