Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-03-22
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures. Proc. of 5th Compton Symp., Portsmouth 1999
Scientific paper
10.1063/1.1303203
We report on the long term monitoring of the GINGA transient source GS 1826-238 performed with the BeppoSAX Wide Fiels Camera (WFC) instrument, during four different observing campaigns covering October 1996 - September 1999. WFC detection of type-I bursting activity from the source ruled out its proposed black hole candidacy and clearly suggested the compact object related to GS 1826-238 to be a weakly magnetized neutron star. The analysis of the arrival times of the observed 78 bursts lead to the discovery of a recurrence of ~5.75 hours with a spread of 38 minutes (FWHM) along more than 3 years monitoring data (Ubertini et al., 1999). We performed a more detailed analysis of the whole available data, and evidence of shortening of the recurrence time, together with a drastic narrowing in the spread (down to a few minutes) was observed on a one year time scale. Possible relation with the source X-ray persistent emission is discussed.
Bazzano Angela
Cocchi Massimo
Heise Jaret
in 't Zand J. M. J.
Muller Jean-Michel
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