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Chandra Observation of the Persistent Emission from the Dipping Source XB 1916-053
R. Iaria, T. Di Salvo, G. Lavagetto +2
We present the results of a 50 ks long Chandra observation of the dipping source XB 1916-053. During the observation two X-ray bursts occurred and the dips were not present at each…
An XMM-Newton study of the 401 Hz accreting pulsar SAX J1808.4-3658 in quiescence
S. Campana, L. Stella, F. Gastaldello +6
SAX J1808.4-3658 is a unique source being the first Low Mass X-ray Binary showing coherent pulsations at a spin period comparable to that of millisecond radio pulsars. Here we pres…
A BeppoSAX Observation of KS 1731-260 in its Quiescent State: Constraints on the NS Magnetic Field
L. Burderi, T. Di Salvo, L. Stella +10
We report here the results of a 90 ks BeppoSAX observation of the low mass X-ray binary and atoll source KS 1731-260 during a quiescent phase. From this observation we derive a sou…
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…
A Hard Tail in the Broad Band Spectrum of the Dipper XB 1254-690
R. Iaria, T. Di Salvo, L. Burderi +1
We report on the results of spectral analysis of the dipping source XB 1254-690 observed by the BeppoSAX satellite. We find that the X-ray dips are not present during the BeppoSAX…
The Composite Broad Band Spectrum of Cir X-1 at the Periastron: a Peculiar Z-source
R. Iaria, L. Burderi, T. Di Salvo +2
We report on the spectral analysis of the peculiar source Cir X-1 observed by the BeppoSAX satellite when the X-ray source was near the periastron. A flare lasting $\sim 6 \times 1…
The Broad Band Spectrum of MXB 1728-34 Observed by BeppoSAX
T. Di Salvo, R. Iaria, L. Burderi +1
We report on the results of a broad band (0.1-100 keV) spectral analysis of the bursting atoll source MXB 1728-34 observed by the BeppoSAX satellite. Three bursts were present duri…