Search Publications
Phase-dependent UV spectra of UX Ursae Majoris.
Jameson, R. F.; King, A. R.; Sherrington, M. R. +1 more
The authors report phase-dependent UV spectra of UX UMa. The behaviour of the continuum during eclipse is as expected for an optically thick accretion disc. The authors confirm that the C IV λ1549 emission line is not eclipsed, and show that several other lines undergo partial or total eclipses. This behaviour is shown to be consistent with simple…
IUE spectrum of the IO torus - Identification of the 5S2-3P2,1 transition of S III
Skinner, T. E.; Durrance, S. T.; Feldman, P. D. +3 more
A low-resolution ultraviolet (1150 - 1800 Å) spectrum of the Io torus has been obtained with IUE. Brightness values for emission features due to S+, S++, S+++, and an upper limit for O++ have been determined simultaneously. The splitting in the emission feature near 1729 Å was clearly apparent. The most …
Abundances of carbon-bearing diatomic molecules in diffuse interstellar clouds.
Blades, J. C.; Whittet, D. C. B.; Somerville, W. B. +2 more
In order to test in detail theories concerning the gas-phase chemistry of light interstellar molecules, it is necessary to have a coherent body of observational data for a large number of sight lines. In the present investigation new and previously published data for 22 stellar lines of sight are combined to provide a basis for the study of the re…
Iron and magnesium in the white dwarf GD 40 : a test of diffusion theory.
Shipman, H. L.; Greenstein, J. L.
An outstanding problem in interpreting the properties of white-dwarf stars is related to the understanding of the chemical abundances in their atmospheres. The hydrogen-rich white-dwarf stars have monoelemental atmospheres, with small quantities of helium and no heavier elements observed in most, possibly all, stars with visible H lines. The heliu…
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 composite UV emission spectrum of Seyfert 1 galaxies.
Tarenghi, M.; Veron, P.; Veron-Cetty, M. P.
A composite spectrum is built in the wavelength range λλ1200-3000 Å, from IUE spectra of 27 Seyfert 1 nuclei. Comparisons with spectra of quasars show that all emission features seen in quasars, including the Fe II UV multiplets, are also observed in the much less luminous Seyfert 1 nuclei. This is taken as a confirmation that Seyfert 1 nuclei are…
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…