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X-ray and optical monitoring of the peculiar source 4U 1700+24/V934 Her
Cusumano, G.; Palazzi, E.; Frontera, F. +10 more
We report on ASCA and BeppoSAX X-ray broad band observations of the galactic low-luminosity X-ray source 4U 1700+24 performed on 1995 and 1998, respectively, and on (quasi-)simultaneous ground observations of its optical counterpart, V934 Her, from the Loiano 1.5-meter telescope. In order to better understand the nature of the source we also analy…
A study of accretion discs around rapidly rotating neutron stars in general relativity and its applications to four low mass X-ray binaries
Bhattacharyya, Sudip
We calculate the accretion disc temperature profiles, disc luminosities and boundary layer luminosities for rapidly rotating neutron stars considering the full effect of general relativity. We compare the theoretical values of these quantities with their values inferred from EXOSAT data for four low mass X-ray binary sources: XB 1820-30, GX 17+2, …
Analysis of archival EXOSAT data on the X-ray burst source Serpens X-1
Min, K. W.; Seon, K. -I.
We present analysis of data obtained from the Medium Energy proportional counter array (ME) from the EXOSAT observations of the X-ray burst source Ser X-1 made in 1983 and 1985. From the combined analysis of the spectral and fast variability properties, we show that the source is an atoll source in the banana state during the observations. The per…
The Ultraviolet Light Curve of LMC X-4: X-Ray Heating of the O Star and Accretion Disk
Boroson, Bram; Vrtilek, Saeqa Dil; Preciado, Michael E.
We present an archival study of ultraviolet spectra of the X-ray binary LMC X-4 obtained with the IUE satellite. We fit these spectra with models that incorporate the X-ray heating of the O star and accretion disk. A systematic analysis of the UV continuum confirms the general picture of an O star that fills its Roche lobe and is heated by X-rays …