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Coordinated observation of the massive system 4U 1700+24 = HD 154791.

Frontera, F.; Manzo, G.; Robba, N. R. +7 more

The authors report results from multifrequency observations of the X-ray source 4U 1700+24 / HD 154791. This source was observed simultaneously with the EXOSAT and IUE satellites on March 25, 1985, and it is continuously monitored in the optical band at the Bologna Astronomical Observatory since July 1984. Their observations show source features w…

Variability of GX 3+1 observed with EXOSAT.

Frontera, F.; Stella, L.; Robba, N. R. +1 more

The authors report results from an observation of the X-ray source GX 3+1 carried out with the EXOSAT satellite on 1983, October 23. The source showed a strong X-ray variability in excess of the counting statistics noise. This variability increased toward low frequencies ("red noise") and was different in different energy bands, with the lower ene…