X-ray Column Density Towards The Low Mass X-ray Binary 4U 1608-522

Physics

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Scientific paper

We request a 25~ks observation of the low-mass X-ray binary 4U 1608-522 with Chandra HETG in order to measure the interstellar extinction towards the source using absorption edges in its spectrum. The measurement of the column density is critical for two reasons. First, we will employ the independent grating measurement when fitting continuum X-ray spectra of the source to determine the temperature of the neutron star surface. Second, we will employ the extinction measurement to determine the distance to the source using a technique that makes use of red clump stars in the field of view of the source, which we have already extracted from the 2MASS archival data. The ultimate goal is to determine the mass and radius of the neutron star in this binary to a high accuracy.

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