BeppoSAX observations of the Her X-1 short-on and anomalous low-states

Details BeppoSAX observations of the Her X-1 short-on and anomalous low-states BeppoSAX observations of the Her X-1 short-on and anomalous low-states

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..599..838p&link_type=abstract

X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. Edited by Nicholas E. White, Giuseppe Malaguti, and G

Astronomy and Astrophysics

Astronomy

X-Ray Binaries, Eclipsing Binaries, X-Ray Sources, X-Ray Bursts, Neutron Stars, Accretion And Accretion Disks

Scientific paper

BeppoSAX recently observed the short-on and anomalous low-states of Her X-1. During the short-on state there are long intervals where the NH is >5×1022 atom cm-2. These intervals become longer and occur ~0.3 day earlier during each orbital cycle as the short-on state progresses. During intervals of high absorption the 0.1 keV blackbody is clearly detected. This implies the presence of separate scattering and absorbing components, or partial covering. Using BeppoSAX and RXTE data we discovered low-amplitude pulsations during the anomalous low-state of Her X-1 in 1999 July. The pulse period indicates that the Her X-1 underwent substantial spin-down close to the start of the anomalous low-state. .

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