New ultracompact binaries, new opportunities: the case for 1A 1246-588

Details New ultracompact binaries, new opportunities: the case for 1A 1246-588 New ultracompact binaries, new opportunities: the case for 1A 1246-588

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop...55i&link_type=abstract

XMM-Newton Proposal ID #04013901

Computer Science

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, A 1246-588, Xmm-Newton Proposal 04013901

Scientific paper

1A 1246-588 is a persistently accreting low-mass X-ray binary at a distance of 5 kpc and with an absorption of NH=4E21 cm-2. The persistent luminosity is ~0.5% of the Eddington limit. This puts the source in an interesting accretion regime, possibly due to an ultracompact binary orbit. We propose to observe 1A 1246-588with XMM-Newton and VLT/FORS2 to secure the suspected optical counterpart and ultracompact nature, carry out high-resolution spectroscopy of suspected anomalous abundances of Ne, Fe and O with RGS and H, He, C and O with VLT/FORS2, and to search for an orbital period in the X-ray lightcurve to investigate the evolutionary history of the binary.

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