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17 papers · 2 filters
Discovery of a Transient Absorption Edge in the X-ray Spectrum of GRB 990705
L. Amati, F. Frontera, M. Vietri +18
We report the discovery of a transient equivalent hydrogen column density with an absorption edge at ~3.8 kiloelectron volts in the spectrum of the prompt x-ray emission of gamma-r…
Helioseismology and solar neutrinos: an update
G. Fiorentini, B. Ricci, F. L. Villante
We review recent advances concerning helioseismology, solar models and solar neutrinos. Particularly we address the following points: i) helioseismic tests of recent SSMs; ii) pred…
BeppoSAX confirmation of beamed afterglow emission from GRB990510
Elena Pian, Paolo Soffitta, Alessandro Alessi +8
We compare the prompt X-ray (2-10 keV) emission of GRB990510 measured by the BeppoSAX Wide Field Cameras (WFC) during the burst to the X-ray afterglow detected by the BeppoSAX Narr…
Helioseismology and screening of nuclear reactions in the Sun
G. Fiorentini, B. Ricci, F. L. Villante
We show that models for screening of nuclear reactions in the Sun can be tested by means of helioseismology. As well known, solar models using the weak screening factors are in agr…
Discovery of a redshifted Iron K-line in the X-ray afterglow of GRB 000214
L. A. Antonelli, L. Piro, M. Vietri +13
We report the detection (3 sigma significance level) of a strong iron emission line in the X-ray spectrum of the afterglow of GRB 000214 (``Valentine's Day Burst'') observed by Bep…
Broad band spectrum of Cygnus X-1 in two spectral states with BeppoSAX
F. Frontera, E. Palazzi, A. A. Zdziarski +13
We report on the 0.5--200 keV spectral properties of Cyg X-1 observed at different epochs with the Narrow Field Instruments of the BeppoSAX satellite. The source was in its soft st…