Multiple High-resolution Chandra Grating Observations of Her X-1

Details Multiple High-resolution Chandra Grating Observations of Her X-1 Multiple High-resolution Chandra Grating Observations of Her X-1

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..968..241j&link_type=abstract

ASTROPHYSICS OF COMPACT OBJECTS: International Conference on Astrophysics of Compact Objects. AIP Conference Proceedings, Volum

Astronomy and Astrophysics

Astrophysics

X-Ray Binaries, Pulsars, Neutron Stars

Scientific paper

We present an analysis of multiple high-resolution Chandra grating observations of the X-ray binary pulsar Her X-1. With a total exposure of 170 ks, six observations are separated by years and cover three combinations of orbital and super-orbital phases. The study aims to determine the properties of the photoionized emission and its dependence on variations in the spectral continuum during various phases. In this proceeding paper we present some preliminary results with regards to the variable spectral continuum. The continua can be described by a partial covering model which is consistent with the high energy spectra observed with RXTE. In addition, an additional thermal blackbody component is required to fit the soft band below 12 Å (~1 keV). Most of the variability is caused by high absorption columns varying from (1-3)×1023 cm-2.

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