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Preprint 01e/96

OSSE observations of Her X-1 during the Main-On state

M. Kunz(1), E. Kendziorra(1), P. Kretschmar(1), M. Maisack(1), R. Staubert(1), M.P. Ulmer(2), J.D. Kurfess(3), and R.B. Wilson(4)

(1)Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2)Northwestern University, Evanston, IL 60208, USA
(3)Naval Research Laboratory, Washington, DC 20375, USA
(4)Marshall Space Flight Center, Huntsville, AL 35812, USA

Contribution to the 3rd COMPTON Gamma Ray Observatory Symposium, München, Germany, June 12-14, 1995
accepted by Astronomy & Astrophysics Suppl.

Abstract. The binary X-ray pulsar Her X-1 has been observed by CGRO-OSSE during its Main-On state in July 1994. The average pulse period is determined. Main-On pulse profiles in the 30-60keV range for successive binary orbits are compatible with a constant pulse width. A thin thermal bremsstrahlung spectrum is fitted to the phase average data, yielding kT=15(1)keV.

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

Paper (27k gzip'ed Postscript including figures)

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Jürgen Barnstedt (barnstedt AT astro.uni-tuebingen.de)
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