Search Publications
An analysis of the reflection spectrum of Jupiter from 1500 A to 1740 A
Gladstone, G. R.; Yung, Y. L.
The Jovian reflection spectrum was modeled to determine the mixing ratios of C2H2, the upper limits to mixing ratios of C2H4, C4H2, and NH3, to detect the amount of dust in the stratosphere, and to measure the intensity of the H2 Lyman band dayglow emission. Data were gathered by the IUE spacecraft in the wavelength regions 1500 A to 1740 A, conce…
Identification and properties of the M giant/X-ray system HD 154791 =2A 1704+241.
Koenigsberger, G.; Elvis, M.; Watson, M. G. +7 more
The Aerial V X-ray source 2A 1704+241 (= 4U 1700+24 = 3A 1703+241) is identified with the M3 II star HD 154791. The identification is based on a precise X-ray position determined by the HEAO 1 scanning modulation collimator and the Einstein Observatory imaging proportional counter, together with a spectrum measured by the International Ultraviolet…
The resonance lines of aluminum in IUE spectra of B-type chemically peculiar stars.
Takada, M.; Sadakane, K.; Jugaku, J.
The resonance lines of aluminum in IUE spectra of 22 Hg-Mn stars, five Si-type (magnetic) stars, seven helium-weak stars, and seven normal stars are analyzed. The Al II resonance line at 1670.79 A and the Al III line at 1862.79 A are used to determine the Al Abundances. The Al abundances in normal stars are found to be nearly normal except for Alp…
An alternative model for the atmospheres of Wolf-Rayet and O stars.
Underhill, A. B.
The hypothesis of Beals (1929) and of Menzel (1929) that the spectrum of a Wolf-Rayet star is the result of spherically symmetric outflow of a hot, strongly ionized plasma has provided considerable insight into the physical state of the atmospheres of Wolf-Rayet stars. However, modern observations yield a number of results which are contradictory …
The diffuse interstellar feature at 4430 A and interstellar extinction in the far-ultraviolet
Bohlin, R. C.; Witt, A. N.; Stecher, T. P.
IUE measurements have been obtained for the UV extinction characteristics of 20 reddened stars previously reported to have anomalously high or low A(4430)/E(B-V) ratios, in order to conduct a first statistical study of the correlations between these ratios and interstellar extinction features in the UV. A marginally significant positive correlatio…
Molecular emission bands in the ultraviolet spectrum of the Red Rectangle star HD 44179.
Sitko, M. L.
New observations of the ultraviolet spectrum of HD 44179 are reported. Absorption due to the CO molecule is present in the spectrum, with NCO ≈ 1018 cm-2. Emission due to either CO or a molecule containing C≡C, C≡N, C-C, and C-H bonds (or both) is also present.
IUE observations of the exciting stars of giant HII regions in M 33 :supermassive stars ?
Hutchings, J. B.; Massey, P.
International Ultraviolet Explorer ultraviolet spectrometry is presented for seven bright starlike objects located in large H II regions in M33. Six of these have UV spectra very similar to R136a, the alleged supermassive star in the center of the 30 Dor nebula in the LMC. The UV line spectra suggest temperatures of 40,000-45,000 K. These temperat…
Outer atmospheres of cool stars. XIV. A model for the chromosphere and transition region of beta Ceti (G9.5 III).
Eriksson, K.; Linsky, J. L.; Simon, T.
In the present chromospheric and transition region model for Beta Ceti, which is consistent with IUE spectra of the Mg II, C II, and C IV resonance lines, the Mg II h and k lines are treated in partial redistribution and the C II and C IV lines in complete redistribution. Computed line fluxes are presented for a range of models to show the range o…
X-ray and UV observations of the BL Lacertae object 3C 66A.
Maccagni, D.; Maraschi, L.; Tanzi, E. G. +2 more
The energy distribution of the BL Lac object 3C 66A has been investigated in the soft X-ray range by means of repeated observations with the Einstein Observatory and in the UV range by means of the IUE satellite. The available optical photometry from 1979 to 1981 is reported. 3C 66A is characterized by violent X-ray activity over a time scale of 6…
The circumstellar dust of MU Cephei.
Martin, P. G.; Rogers, C.; Crabtree, D. R.
An accurate solution to the equation of transfer in spherical geometry (including an anisotropic phase function) is used to model IUE observations of the circumstellar extinction of Mu Cep. Some grain materials can thus be eliminated from consideration while others can be restricted in grain size (and envelope optical depth). Further discriminatio…