Evolution of the 1.24s pulse profile during a Her X-1 turn-on

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X-Rays: Stars, Pulsars

Scientific paper

In 1997 September we observed Her X-1 in a two day long continuous monitoring with the Rossi X-ray Timing Explorer (RXTE). In this paper we report on the results of a timing analysis of 32 highly time resolved light curves covering the whole time of the turn-on in an energy range from 2 to 40 keV. A detailed timing analysis reveals, that the pulse profile undergoes no systematic change over the time of the turn-on, contrary to earlier observations of Her X-1 in the main-on, short-on or turn-off phases of the 35 day cycle. On the other hand the pulse profile shows a systematic change in its shape dependent on the energy especially in the range from 0 to 18.9 keV.

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