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Astron. Astrophys. 317, L87-L90 (1997)

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Letter to the Editor

On the persistent X-ray emission from the soft -ray repeaters

V.V. Usov

Department of Condensed Matter Physics, Weizmann Institute, Rehovot 76100, Israel

Received 19 September 1996 / Accepted 12 November 1996


It is suggested that the persistent X-ray emission from the soft [FORMULA] -ray repeaters is the thermal radiation of neutron stars which is enhanced by a factor of 10 or more due to the effect of a very strong magnetic field on the thermal structure of the neutron star envelope. For the thermal luminosity to be consistent with the persistent X-ray luminosity, the field strength at the neutron star surface has to be of the order of [FORMULA] G. If it is confirmed that the soft [FORMULA] -ray repeaters are neutron stars with negligible accretion, then the presence of such a strong magnetic field is inevitable.

Key words: gamma-rays: bursters - stars: neutron - magnetic fields - radiation mechanisms: thermal

Send offprint requests to: V.V. Usov

© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998