X-ray Column Density towards the Low Mass X-ray Binary 4U 1702-429

Details X-ray Column Density towards the Low Mass X-ray Binary 4U 1702-429 X-ray Column Density towards the Low Mass X-ray Binary 4U 1702-429

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008xmm..prop..106o&link_type=abstract

XMM-Newton Proposal ID #06040301

Computer Science

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, 4U 1702-429

Scientific paper

We propose to use the RGS onboard XMM-Newton to measure the Hydrogen column density towards the X-ray binary 4U~1702-429. We will detect and model the Ne, Mg, Si, Fe and O absorption edges in the RGS spectra of the source to determine interstellar elemental abundances along the line of sight. We will convert these abundances to an equivalent hydrogen column density in order to (i) remove a source of large uncertainty in modeling the continuum source spectra, and (ii) measure the distance to the X-ray binary by employing a technique that compares the reddening of a source to that of red clump stars along the line of sight. Our ultimate goal is to combine the distance measurement with existing X-ray Type-I burst data to determine the mass and radius of the neutron star.

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