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Preprint 11c/00

Evolution of the 1.24 s Pulse Profile during a HER X-1 Turn-On

M. Kuster (1), J. Wilms (1), R. Staubert (1), I. Kreykenbohm (1), S. Blum (2), D. Gruber (3), R. Rothschild (3)

(1) Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2) Institut für Astronomie und Astrophysik, Theor. Astrophysik, University of Tübingen, Germany
(3) CASS, University of California, San Diego, La Jolla, CA 92093, U.S.A.

To appear in: ESA-SP

Abstract. 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.

Key words: X-rays: stars; stars: pulsars: individual: Her X-1

Paper (167k gzip'ed Postscript including figures)

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