Forum Springer Astron. Astrophys.
Forum Whats New Search Orders

Astron. Astrophys. 361, 240-244 (2000)

Table of Contents
Available formats: HTML | PDF | (gzipped) PostScript

Beppo SAX observations of SGR 1806-20

S. Mereghetti 1, D. Cremonesi 1, M. Feroci 2 and M. Tavani 1

1 Istituto di Fisica Cosmica "G.Occhialini", Via Bassini 15, 20133 Milano, Italy
2 Istituto di Astrofisica Spaziale, CNR, Via Fosso del Cavaliere 100, 00133 Roma, Italy

Received 9 May 2000 / Accepted 15 June 2000


We have observed with the BeppoSAX satellite the quiescent counterpart of the Soft Gamma-ray Repeater SGR 1806-20. Observations performed in October 1998 and in March 1999 showed that this pulsar continued its long term spin-down trend at an average rate of [FORMULA]8 10-11 s s-1 while its flux and spectrum remained remarkably constant between the two observations, despite the soft gamma-ray bursting activity that occurred in this period. We also reanalyzed archival ASCA data, that when compared with the new BeppoSAX observations, show evidence for a long term variation in luminosity.

Key words: stars: individual: SGR 1806-20 – stars: neutron – gamma rays: observations – X-rays: stars

Send offprint requests to: S. Mereghetti (sandro@ifctr.mi.cnr.it)

© European Southern Observatory (ESO) 2000

Online publication: September 5, 2000