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A comparative study of the ultraviolet spectrum of hot subdwarfs.
Altamore, A.; Viotti, R.; Rossi, L.
The high and low resolution IUE spectra of four O subdwarfs (BD +75°325, BD +48°1777, BD +37°1977, BD +37°442) are analyzed. Line identification is given for the most abundant ions in the far ultraviolet. Fe V is by far the ion with the largest number of lines. Broad P Cygni profiles of the N V and C IV resonance doublets are observed in BD +37°44…
On the λ 2800 Å interstellar extinction feature
Wickramasinghe, N. C.; Karim, L. M.; Hoyle, F.
We answer our critics and confirm the reality of a feature in the interstellar extinction curve near λ 2800 Å for stars showing abnormally low graphite absorption.
Comparison of variations in the visible and ultraviolet spectra of a Centauri.
Fahey, R. P.
Equivalent-width and central depth measurements of some ultraviolet absorption lines from the spectrum of the He I spectrum variable star a Cen (HD 125823) are presented. The measurements are from 53 short-wavelength and 52 long-wavelength, high-resolution spectrographs taken with the IUE satellite over a 25d period during 1978 July and…
Ultraviolet spectroscopy of cometary comae: An update
Feldman, P. D.
Since its launch in 1978 the International Ultraviolet Explorer (IUE) satellite observatory has been used to record ultraviolet spectra of nearly two dozen comets. These observations have been applied principally to studies of the composition, chemistry and evolution of the gaseous coma and more recently, with the substantially increased data base…
Line identifications in the ultraviolet (2590-3230 A) spectrum of thehydrogen-deficient star HD 182040.
Johnson, H. R.; Ameen, M. M.; Eaton, J. A.
Identifications for absorption features detected in the ultraviolet spectrum of the hydrogen-deficient supergiant carbon star HD 182040 observed at high resolution with the IUE satellite are presented. The spectrum in this range is filled with blended lines of the iron-peak elements, with Fe I and Cr II dominating the spectrum. Spectra definitely …
Correlation of gamma-ray fluxes with southern hemisphere CO data.
Manchester, R. N.; Wolfendale, A. W.; Whiteoak, J. B. +3 more
A new radio survey of the C-12O molecule in the Galactic plane covering the longitude range l:294 - 358 deg is compared with the flux of high energy gamma rays in the same region. A good correlation between the two is found, and it is shown that the data are consistent with the hypothesis that most of the gamma-ray flux is produced by the cosmic-r…
IUE observations of high velocity gas towards the M 16 nebula.
Welsh, B. Y.
The star HD 168183, which is part of the giant H II region-molecular cloud complex of M16 (NGC 6611), has been observed at high resolution using the IUE satellite. High velocity interstellar absorption components have been detected at velocities of -83, -38 and +40 km s-1 and it is proposed that a stellar wind-driven shock-front, intera…
Radial velocity and profile variations of the ultraviolet circumstellar lines in ζ tauri
Hirata, R.; Dawanas, D. N.
The radial velocity and profile variations of UV lines of the shell star ζ Tau have been examined in the IUE spectra obtained in 1978–1982. The neutral atoms, and once or twice-ionized ions (exceptCII, AlIII, SiIII resonance lines) follow the same velocity variations as in the visual spectra, while the SiIV andCIV resonance lines show a constant n…
Multifrequency observations of the quasi-stellar object Ton 1542.
Bruhweiler, F. C.; Miller, H. R.; Worrall, D. M. +3 more
The authors present single-epoch multifrequency data for the radio-quiet low-redshift QSO Ton 1542, spanning radio through ultraviolet wavelengths. They measure a 3σ upper limit of 9.2 mJy for the 20.3 GHz flux density. The first ultraviolet spectrum of this object is presented and discussed. The authors find a particularly strong excess of flux d…
Spectroscopic Segregation in Binary Systems
Darius, J.
Binary systems displaying spectroscopic segregation, whereby line spectra of the two components overlap little or not at all in wavelength, account for a small subset of LUV objects (late-type ultraviolet). Optical and ultraviolet (IUE) spectra for one such system, HD 15351+UV0225+13 (F4-5 V+sdO), are presented and a few related systems described.…