Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-06-12
Astronomy and Astrophysics
Astrophysics
5 pages, 5 figures, accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20010820
Results of a BeppoSAX observation of Her X-1 in 2000 October during the first main-on state after the longest recorded anomalous low-state are presented. The 0.1-30 keV spectrum, light curve and pulse profile are all consistent with those measured during previous main on-states, indicating that Her X-1 has resumed its regular 35 day cycle with similar on-state properties as before. However, from a comparison of the measured pulse period with that obtained close to the start of the anomalous low-state, it is evident that Her X-1 continued to spin-down strongly during the anomalous low-state such that the pulse period has returned to a similar value as ~15 years ago. Additionally, the occurrence time of the main-on states after the end of the anomalous low-state indicate that a change in the length, or phasing, of the 35-day cycle occurred during the anomalous low-state.
Oosterbroek Tim
Orlandini Mauro
Parmar Arvind N.
Santangelo Andrea
Segreto Alberto
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