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Study of the Cir X--1 Broad Band Spectrum at Orbital Phases Close to the Apoastron
R. Iaria, T. Di Salvo, N. R. Robba +1
We report on the results of a BeppoSAX (1.8--200 keV) observation of the peculiar X-ray binary source Circinus X--1 (Cir X--1) at the orbital phases between 0.61 and 0.63. We find…
The BeppoSAX 0.1 - 100 keV Spectrum of the X-ray Pulsar 4U 1538-52
N. R. Robba, L. Burderi, T. Di Salvo +2
We report the results of temporal and spectral analysis performed on the X-ray pulsar 4U 1538-52 observed by BeppoSAX. We obtained a new estimate of the spin period of the neutron…
Partially Absorbed Comptonization Spectrum from the Nearly Edge-on Source X 1822-371
R. Iaria, T. Di Salvo, L. Burderi +1
We report the results of a spectral analysis over the range 0.1-200 keV performed on the dipping source X 1822-371 observed by BeppoSAX. We find the best fit to the continuum using…
The 0.1-100 keV Spectrum of LMC X-4 in the High State: Evidence for a High Energy Cyclotron Absorption Line
A. La Barbera, L. Burderi, T. Di Salvo +2
We report on the spectral analysis of the X-ray pulsar LMC X-4 in its high state out of eclipse observed by BeppoSAX. During this observation no coherent pulsations are detected. T…
Where Have All the Submillisecond Pulsars Gone?
L. Burderi, F. D'Antona, M. T. Menna +8
The existence of pulsars with spin period below one millisecond is expected, though they have not been detected up to now. Their formation depends on the quantity of matter accrete…