Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-03-10
Astronomy and Astrophysics
Astrophysics
6 pages, 6 figures, to be published in the proceedings of "Interacting Binaries: Accretion, Evolution and Outcomes", 4-10 July
Scientific paper
10.1063/1.2130274
We present the results of a series of XMM-Newton EPIC and OM observations of Her X-1, spread over a wide range of the 35 d precession period. We confirm that the spin modulation of the neutron star is weak or absent in the low state - in marked contrast to the main or short-on states. The strong fluorescence emission line at ~6.4 keV is detected in all observations (apart from one taken in the middle of eclipse), with higher line energy, width and normalisation during the main-on state. In addition, we report the detection of a second line near 7 keV in 10 of the 15 observations taken during the low-intensity states of the system. We discuss these observations in the context of previous observations, investigate the origin of the soft and hard X-rays and consider the emission site of the 6.4keV and 7keV emission lines.
Boyd Patricia T.
den Herder Jan Willem
Hailey Charles J.
Jimenez-Garate Mario A.
Ramsay Gavin
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