Three hard X-ray transients: GRO J0422+32, GRS 1716-24, GRS 1009-45. Broad band observations by roentgen-MIR-KVANT observatory

• Published in: Advances in space research Vol. 19; no. 1; pp. 29 - 34
• Main Authors: Kaniovsky, A.S, Arefiev, V.A, Aleksandrovich, N.L, Borkous, V.V, Borozdin, K.N, Efremov, V.V, Sunyaev, R.A, Kendziorra, E, Kretschmar, P, Kunz, M, Maisack, M, Staubert, R, Doebereiner, S, Englhauser, J, Pietsch, W, Reppin, C, Truemper, J, Skinner, G.K, Willmore, A.P, Brinkman, A.C, Heise, J, Jager, R
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 1997
• ISSN: 0273-1177; 1879-1948
• DOI: 10.1016/S0273-1177(97)00033-1

Three bright X-ray transient sources GRO J0422+32, GRS 1009-45 and GRS 1716-24 detected in 1992–1993 continue the sequence of such transient sources which were observed by the broad-band MIR-KVANT X-ray observatory in the period since 1988. Two of them, GRO J0422+32 and GRS 1716-29, may be classified as hard X-ray novae where the X-ray spectrum formation is probably dominated by comptonization, GRS 1009-45 is a typical soft X-ray nova with a strong soft thermal component and hard power-law tail. In this paper the results of broad-band (from 2 to 200–500 keV) spectroscopy for these sources are presented and are compared to earlier observations of other X-ray novae.