Search Publications
The partial phase of the eclipse of Epsilon Aurigae.
Kondo, Y.; Stencel, R. E.; Chapman, R. D.
Ultraviolet spectra of the peculiar eclipsing binary Epsilon Aurigae (FO Ia + ?) were obtained with the International Ultraviolet Explorer at pre-eclipse and ingress partial phases. The results show a wavelength dependence of the eclipse in contrast to the grayness (non-wavelength dependence) of the eclipse observed in visible light. From the curr…
The enigmatic composite system HD 45166 - B8V +qWR or SdO ?
Willis, A. J.; Stickland, D. J.
High- and low-resolution IUE ultraviolet spectroscopic observations of the binary system HD 45166, previously classified as qWR + B8 V, obtained at several epochs are presented. The UV spectra show a photospheric absorption spectrum from highly ionized species like Fe v, which with the observation of B8 V absorptions in the visible, confirms the b…
The UV spectrum of the BL Lac object PKS 0521-36.
Maraschi, L.; Tanzi, E. G.; Treves, A. +3 more
Ultraviolet observations (1200-3000 Å) with the IUE satellite of the BL Lac object PKS 0521-36 are presented. The only emission line which appears clearly in the spectrum is Lyα, which is asymmetric with a component displaced ≡3000 km s-1 to the red. The intensity of the line and the upper limits on other lines are compared with the mod…
Observations of two peculiar emission objects in the Large MagellanicCloud.
Kafatos, M.; Stencel, R. E.; Michalitsianos, A. G. +1 more
Ultraviolet and visual wavelength spectra were obtained of two peculiar emission objects, Henize S63 and Sanduleak's star in the Large Magellanic Cloud. Previously not observed in the near- or far-ultraviolet, both objects exhibit strong permitted and semiforbidden line emissions. Estimates based on the absolute continuum flux of the hot companion…
HD 207739 : A strange composite star.
Kondo, Y.; Holm, A. V.; Parsons, S. B.
This star, classified F8 IIe + B:, has a very unusual ultraviolet spectrum, with abnormally strong and numerous absorption features in the far-UV and exceptionally strong Mg II emission. There is some resemblance to shell and pre-main-sequence B stars, but it more closely matches the strange spectra of the eclipsing systems VV Cep and SX Cas, and …
Element identifications in the ultraviolet spectrum of HD 101065.
Stickland, D. J.; Byrne, P. B.; Wegner, G. +1 more
Ultraviolet spectroscopic observations with the IUE satellite of the controversial peculiar star HD 101065 are presented and discussed. Low-resolution spectra combined with published visual and infrared broad-band photometry show that the star's spectral energy distribution is greatly distorted, presumably by the severe line blanketing. However, t…
Simultaneous X-ray and ultraviolet observations of Epsilon Orionis and Kappa Orionis.
Dupree, A. K.; Cassinelli, J. P.; Hartmann, L. +2 more
Simultaneous observations were made with the Einstein Observatory, the International Ultraviolet Explorer, and the Copernicus satellite of the supergiant stars η Ori (B0 Ia) and κ Ori (B0.5 Ia). The X-ray observations spanned periods of 7 hours and 10 hours, and the ultraviolet observations spanned 15 and 18 hours for ηOri and κ Ori, respectively.…
Interstellar absorption lines in the spectrum of 3C 273.
York, D. G.; Cowie, L. L.; Blades, J. C. +3 more
Absorption lines near the rest wavelengths of the Si IV doublet (wavelengths 1393.76, 1402.77) with equivalent widths 533 and 235 mA are reported in the spectrum of QSO 3C 273. The profiles show the nature of hot gas along a high-latitude (b = 64 deg) line of sight through our entire halo. The lines have full width at half-maxima of 100 km/s, comp…
A multiwavelength study of the short-period cataclysmic variable V442 Ophiuchi.
Szkody, P.; Shafter, A. W.
The results of a program of observations of the cataclysmic variable V442 Oph from UV to IR wavelengths are reported. The observations comprise IUE SWP and LWR-camera spectra from October, 1981; UBVr and R photometry at Manastash Ridge Observatory from August, 1980; UBV photometry and IR measurements at Kitt Peak from July, 1981; and Coudespectros…
IUE observations of E 1405-451 : a new AM Herculis type cataclysmic variable.
Nousek, J. A.; Pravdo, S. H.
International Ultraviolet Explorer observations of the recently discovered AM Herculis type cataclysmic variable E1405-451 reveal a UV spectrum (1000-3000 A) similar to the other members of the type. The continuum flux distribution rises steeply at short wavelength and shows the effects of interstellar extinction. Best fit parameters for a blackbo…