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IUE ultraviolet spectra of the interacting binary U Cep.
Kondo, Y.; McCluskey, G. E., Jr.; Harvel, C. A.
Twenty-one mid-ultraviolet and three far-ultraviolet spectra of the close interacting binary U Cephei have been obtained with the International Ultraviolet Explorer. The results show that the gas stream leaves the G star, circuits around the B companion some 270 deg and leaves the binary system, confirming the preliminary results. Additional sourc…
Ultraviolet slit spectroscopy in the core of 30 Doradus with the International Ultraviolet Explorer
Koornneef, J.; Mathis, J. S.
Low resolution (about 7 A) IUE observations of the core of the 30 Doradus Nebula in the Large Magellanic Cloud are presented. Data were obtained through the large entrance aperture at 11 different positions in both the long wavelength (1900-3200 A) and short wavelength (1150-2000 A) cameras. The aperture was stepped in 10-arcsec intervals, in the …
A compressed cloud in the VELA supernova remnant
Jenkins, E. B.; Wallerstein, G.; Silk, J. +1 more
Strong interstellar absorption lines of C I, arising from the two excited fine-structure levels, are found in IUE observations of HD 72350 (type B4 III). An analysis of the excited-level populations of C I gives local temperature and pressure limits, and auxiliary data on the limit of column density for excited O I and the carbon ionization help t…
On the nebulosities associated with the extreme of star HD 148937.
Gull, T. R.; Bruhweiler, F. C.; Henize, K. G. +1 more
In order to understand the origin of the extreme Of star HD 148937, a study was undertaken of the interrelations between (1) its associated nebulae, including NGC 6164-5, (2) a 2 deg diameter H II region, (3) an outer dust shell, and (4) a newly identified interstellar bubble. A self-consistent model describing the interaction of HD 148937 with th…
Observations of strong ultraviolet absorptions in the spectrum of theDC white dwarf G 218-8.
Wegner, G.
The spectrum of the 14th magnitude DC white dwarf G218-8 (EG 245) is described. In the visible spectral region the star has been observed with the IIDS scanner attached to the Kitt Peak National Observatory 2.1 m telescope, where it shows a featureless spectrum. However, the ultraviolet observations using the IUE satellite show that strong absorpt…
Electron densities for 10 planetary nebulae derived from the CIII 1907/1909 ratio. II.
Feibelman, W. A.; Hobbs, R. W.; Boggess, A. +1 more
Electron densities for IC 351, IC 2165, J900, IC 3568, NGC 6644, NGC 6891, IC 4997, NGC 7009, Hu 1-2, and IC 5217 are derived from high-dispersion semiforbidden C III spectrograms. For seven of these nebulae, the derived electron density is larger than the values derived from either surface brightness measurements or forbidden line ratios. Only on…
The 1979-1980 eclipse of ZET Aur. II. The emission spectrum.
Stencel, R. E.; Chapman, R. D.
UV observations using the IUE are employed to discuss the strength and changes of Zeta Aur between a second contact and mid-eclipse in 1979, the relative visibility of the supergiant's chromosphere as compared with the circumstellar (CS) nebular scattering of the B star photons, and the origin of the high speed CS components observed at all orbita…
Far-ultraviolet observations of the variable radio star LS I +61 303.
Maraschi, L.; Tanzi, E. G.; Treves, A.
One short wavelength spectrum, 1200-1950 A, and two long wavelength spectra, 1900-3200 A, have been obtained from IUE observations of the radio star LSI plus 61 deg 303 in September 1980. Assuming an E(BV) value of 0.9, as given by the rectification of the 2200 A absorption dip, the ultraviolet continuum is found to be fitted by a model atmosphere…
IUE monitoring of the spatial distribution of the H Ly-alpha emission from Jupiter
Feldman, P. D.; Moos, H. W.; Clarke, J. T.
North-south spatial maps of the Jovian H Lyman-alpha emission observed with the IUE satellite support the identification of a marked longitudinal asymmetry in the equatorial brightness, with the peak around lambda III(1965) = 50-100 deg longitude, and show a weaker planet-wide equatorial brightening above the level predicted by a plane-parallel la…
The ultraviolet spectrum of the high redshift QSO B2 1225+31.
Boksenberg, A.; Snijders, M. A. J.; Pettini, M.
We present low-resolution, near-ultraviolet observations of the bright (V=15.87), high redshift (Zem ≈ 2.2) QSO B2 1225+31, obtained with the IUE long wavelength camera. These spectra provide an important extension to the large body of optical and radio work carried out on this object. The QSO continuum in the ultraviolet agrees well wi…