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The active binary star IIPeg with BeppoSAX
S. Covino, G. Tagliaferri, R. Pallavicini +2
IIPeg is an ideal target to study stellar activity and flares, since intense and long lasting flares have been frequently detected from this system at all wavelengths. We report he…
GRB 990510: linearly polarized radiation from a fireball
S. Covino, D. Lazzati, G. Ghisellini +12
Models for gamma-ray burst afterglows envisage an hyper-relativistic fireball that is decelerated in the ambient medium around the explosion site. This interaction produces a shock…
The identification of the long-period X-ray pulsar 1WGA J1958.2+323 with a Be-star/X-ray binary
G. L. Israel, S. Covino, V. F. Polcaro +1
We present the results of optical observations performed between May and September 1998 of the stars within the position error circle of the recently discovered 12min pulsating X-r…
A BeppoSAX Observation of HD9770: a Visual Triple System Containing a Recently Discovered Short-Period Eclipsing Binary
G. Tagliaferri, S. Covino, G. Cutispoto +1
We have studied the coronal X-ray emission of the recently discovered short-period eclipsing binary HD 9770 with the BeppoSAX satellite. The data from the Low Energy and Medium Ene…