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Astron. Astrophys. 358, 583-586 (2000)

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BeppoSAX observation of Cen X-4 in quiescence

S. Campana 1, L. Stella 2, S. Mereghetti 3 and D. Cremonesi 3

1 Osservatorio Astronomico di Brera, Via Bianchi 46, 23807 Merate, Italy
2 Osservatorio Astronomico di Roma, Via Frascati 33, 00040 Monteporzio Catone (Roma), Italy
3 Istituto di Fisica Cosmica "G. Occhialini", CNR, Via Bassini 15, 20133 Milano, Italy

Received 4 November 1999 / Accepted 11 April 2000

Abstract

We report on a 61 ks BeppoSAX observation of the soft X-ray transient Cen X-4 during quiescence which allowed to study the source X-ray spectrum from [FORMULA] keV to [FORMULA] keV. A two-component spectral model was required, consisting of a black body with temperature of [FORMULA] keV and a power law with photon index [FORMULA]. These values are compatible with earlier ASCA results indicating that Cen X-4 may be stable, within a factor of a few, over a 5 year baseline.

Key words: stars: individual: Cen X-4 – stars: neutron – stars: pulsars: general – X-rays: stars

Send offprint requests to: campana@merate.mi.astro.it

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© European Southern Observatory (ESO) 2000

Online publication: June 8, 2000
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