Institut für Astronomie und Astrophysik

Abteilung Astronomie

Preprint 01a/96

Pulse shape analysis and spectroscopy of A 0535+26 during its 1994 outburst

M. Maisack(1), J.E. Grove(2), W.N. Johnson (2), G.V. Jung(3), E. Kendziorra(1), R.L. Kinzer(2), P. Kretschmar(1), J.D. Kurfess(2), C.H. Starr(3), R. Staubert(1), and M.S. Strickman(2)

(1)Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2)E.O. Hulburt Center for Space Research, Code 7650, Naval Research Laboratory, Washington, DC 20375, USA
(3)Universities Space Research Association, Washington, DC 20024, USA

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

Abstract. The Be X-ray binary A 0535+26 was observed by OSSE on CGRO during a giant outburst in February 1994. Grove et al. (1995) detected a cyclotron absorption feature at 110 keV in the pulse phase averaged spectrum. In this paper, we present the analysis of the dependence of the pulse shape on energy and intensity, and discuss the development of the pulse averaged spectral shape during the observation.

Key words: Stars: magnetic fields; Stars: neutron; Gamma rays: observations

Paper (59k gzip'ed Postscript including figures)

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Jürgen Barnstedt (barnstedt AT astro.uni-tuebingen.de) Last updated 04-Aug-1997