Institut für Astronomie und Astrophysik

Abteilung Astronomie

Preprint 11c/98

Complete Coverage of an X­Ray Turn­On of Her X­1 by RXTE

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

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

3rd Integral Symposium - The Extreme Universe, in press

Abstract. We report on a two day long continuous monitoring of the X-ray binary Her X-1 by the Rossi X-ray Timing Explorer (RXTE). The observation resulted in a complete and highly time-resolved coverage of an X-ray turn-on in the energy range from 3 to 40 keV. The increase in flux from the off-state to the maximum level in the main on-state took almost two days. During these days a pre-eclipse dip, an anomalous dip, and an eclipse occured. We report on the detailed analysis of the spectral and timing evolution over the turn-on.

Key words: -

Paper (70k gzip'ed Postscript including figures)

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Jürgen Barnstedt (barnstedt AT astro.uni-tuebingen.de) Last updated 11-Dec-1998