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XMM-Newton observations of low luminosity Be/X-ray candidates
- Source :
-
Advances in Space Research . Nov2006, Vol. 38 Issue 12, p2782-2784. 3p. - Publication Year :
- 2006
-
Abstract
- Abstract: 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 (L X ∼1032 ergs−1) and the hardness of their X-ray spectra (thin thermal with kT ∼8–10keV 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. [Copyright &y& Elsevier]
- Subjects :
- *BE stars
*X-ray binaries
*X-ray spectroscopy
*X-ray astronomy
Subjects
Details
- Language :
- English
- ISSN :
- 02731177
- Volume :
- 38
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Advances in Space Research
- Publication Type :
- Academic Journal
- Accession number :
- 23216131
- Full Text :
- https://doi.org/10.1016/j.asr.2006.02.075