a Possible Spectral Signature of Ultracompact Low Mass X-Ray Binaries

Details a Possible Spectral Signature of Ultracompact Low Mass X-Ray Binaries a Possible Spectral Signature of Ultracompact Low Mass X-Ray Binaries

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop...31s&link_type=abstract

XMM-Newton Proposal ID #04007901

Other

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, X1832-330, Xmm-Newton Proposal 04007901

Scientific paper

ASCA and BeppoSAX obs. of ultracompact (Porb<1hr) LMXBs revealed 2 possible spectral differences compared to other systems.These are (1)the presence of a discrete feature near 0.7keV (attributed to local overabundance of Ne), and (2)the parameter values when fit with a disk-blackbody and Comptonized continuum.Chandra and XMM observations complicated the picture, confirming a Ne overabundance only in few ultracompact sources, suggesting a possible variability. We wish to test2possible explanations for this variability, and to clarify the emerging picture of a spectral signature for the ultracompact systems using XMM.We propose here to observeX1832-330,the only persistent ultracompact LMXRB in a globular cluster still not investigated with high resolution spectroscopy.

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