Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17086j&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
X-ray line emission from photon-ionized gas is detected in Her X-1 with the XMM-Newton RGS. The N/O abundance ratio is 7 to 10 times the solar value, while C/O is 0.6 times solar, a result of extensive CNO processing in HZ Her, which constrains the age and evolution of this binary system. A new abundance determination technique is used to account for atomic, geometric and plasma equilibrium effects. The variation of the X-ray spectrum with 35 day phase provides further evidence for disk precession. In the low and short-on states, there is narrow line emission resembling that of an accretion disk corona source, from radii 10^11 cm. We measure the temperature of this narrow line region, and we set limits on its density, size, and geometry. In the main-on state, O VII and N VII lines have a 3200+-700 km/s broadening, which if due to orbital motion, yields radii 5 x 10^8 cm. This is near the expected transition region between the disk and the pulsar magnetosphere, based on cyclotron line measurements.
den Herder Jan Willem
Hailey Charles
Jimenez-Garate Mario
Ramsay Gavin
Zane Silvia
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