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Astron. Astrophys. 357, 501-506 (2000)

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BeppoSAXobservation of the transient X-ray pulsar GS 1843+00

S. Piraino 1,2, A. Santangelo 1, A. Segreto 1, S. Giarrusso 1, G. Cusumano 1, S. Del Sordo 1, N.R. Robba 2, D. Dal Fiume 3, M. Orlandini 3, T. Oosterbroek 4 and A.N. Parmar 4

1 Istituto di Fisica Cosmica ed Applicazioni dell'Informatica, CNR, Via Ugo La Malfa 153, 90146 Palermo, Italy
2 Istituto di Fisica, Università di Palermo, Via Archirafi 36, 90123 Palermo, Italy
3 Istituto Tecnologie e Studio Radiazioni Extraterrestri, CNR, Via Gobetti 101, 40129 Bologna, Italy
4 Astrophysics Division, Space Science Department of ESA, ESTEC, P.O. Box 299, 2200 AG Noodwijk, The Netherlands

Received 29 April 1998 / Accepted 16 March 2000

Abstract

We present the results from both the timing and spectroscopic analysis of the transient X-ray pulsar GS 1843+00 observed by the BeppoSAXsatellite on 1997 April 4, when the source was at a luminosity of [FORMULA] erg s-1. GS 1843+00 shows a very hard spectrum that is well fitted by an absorbed power law (NH [FORMULA] cm-2) modified by a high energy cut-off above 6 keV. The source shows a small pulse amplitude in the whole energy band. The pulse profile evolves with energy from a double-peaked to single-peaked shape. The barycentric pulse period is [FORMULA] s.

Key words: stars: binaries: general – stars: neutron – stars: pulsars: individual: GC 1843+00 – X-rays: stars

Send offprint requests to: piraino@ifcai.pa.cnr.it

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© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000
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