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

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

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.2984o&link_type=abstract

Chandra proposal ID #11408340

Physics

Scientific paper

We request a 25 ks observation of the transient low-mass X-ray binary 4U 1608-52 with Chandra HETG to measure the interstellar extinction towards the source using absorption edges in its spectrum. 4U 1608-52 is one of our gold standard sources for the neutron star mass-radius measurements. The column density is used to determine the distance to the source employing a technique that makes use of red clump stars in the field of view of the source. However, so far, only a 5ks XMM observation has been available to measure the column density, which results in large distance errors. Chandra observations will greatly reduce this uncertainty by pinning down the column density with grating observations, which, in turn, will significantly reduce the uncertainties in the neutron star mass and radius.

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