Search Publications
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 …
X-Ray Continuum with an Iron Emission Line from the Radio-Quiet Quasar PHL 909
Ghosh, K. K.; Soundararajaperumal, S.
Results of the spectral analysis of the X-ray (0.1 - 10 keV) spectrum of the radio-quiet quasar, PHL 909, are presented. A spectrum of this quasar which was observed on 1984/349, was obtained from the EXOSAT archives. Different models were used to fit the ME and LE+ME data. Fit parameters to the ME data show a steep spectral index for this quasar …
X-ray, UV, and optical observations of the dwarf nova BV Puppis.
Szkody, Paula; Howell, Steve B.; Kennicutt, Robert
The authors present quiescent state optical-to-IR photometry and IUE and optical spectroscopy as well as midstate EXOSAT and optical spectroscopy which indicate some unusual properties of this little-studied dwarf nova. The observed 2 - 6 keV X-ray flux of 4 - 5×10-12ergs cm-2sec-1 is high for a system at outburst.…
H-alpha variability in X-ray transient source X0331+53.
Iye, M.; Kodaira, K.
Spectroscopic observations of X0331+53 between October 1984 and March 1985 revealed that the equivalent width of Hα emission decreased by a factor of about four relative to that observed one year ago. This finding, in association with the decline of X-ray activity of the source reported by the EXOSAT group, is interpreted to support the binary mod…