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Astron. Astrophys. 334, 895-900 (1998)


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Hard X-ray observations of GX 339-4 with GRANAT /SIGMA

S. Trudolyubov 1, 2, M. Gilfanov 1, 2, E. Churazov 1, 2, R. Sunyaev 1, 2, N. Khavenson 1, A. Dyachkov 1, I. Tserenin 1, K. Sukhanov 1, P. Laurent 3, J. Ballet 3, P. Goldoni 3, J. Paul 3, J-P. Roques 4, V. Borrel 4, L. Bouchet 4 and E. Jourdain 4

1 Space Research Institute, Russian Academy of Sciences Profsoyuznaya 84/32, 117810 Moscow, Russia
2 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85740 Garching, Germany
3 CEA, Centre d'Etudes de Saclay, Orme des Merisiers, F-91191 Gif-sur-Yvette Cedex, France
4 Centre d'Etude Spatiale des Rayonnements 9, Avenue du Colonel Roche, BP 4346, F-31029 Toulouse Cedex, France

Received 15 December 1997 / Accepted 9 March 1998

Abstract

The results of hard X-ray/soft gamma-ray observations of GX 339-4 with GRANAT /SIGMA are reported. The spectral and temporal properties of the source during its four successive hard X-ray outbursts in 1990-1994 were studied in details. We suggest that the mechanism of GX 339-4 outbursts is triggering of the irradiation - driven instability in the low mass binary system.

Key words: stars: individual: GX 339-4 – accretion, accretion disks – black hole physics – gamma-rays: observations – X-rays: stars

Send offprint requests to: S. Trudolyubov,
(trudolyubov@hea.iki.rssi.ru)

© European Southern Observatory (ESO) 1998

Online publication: June 2, 1998

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