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Variable, optically thick, hot plasma observed in interacting binaries
Kondo, Y.; McCluskey, G. E.; Parsons, S. B.
We report recent International Ultraviolet Explorer (IUE) observations of two interacting binaries, R Arae and HD 207739. The ultraviolet spectra indicate the presence of optically-thick, variable hot plasma in those binary systems. These two binaries may belong to a class of binaries that are currently undergoing a rarely observed and probably sh…
Ultraviolet Observations of Three Classical Novae during Early Stages of Decline
Drechsel, H.; Rahe, J.; Wargau, W.
We present IUE UV spectra of the three recent classical novae N Sgr 1982, N Ser 1983, and N Mus 1983, obtained during early decline, transitional stage, and nebular phase, respectively. The line spectra are discussed. Preliminary conclusions concerning CNO over-abundances, shell geometry, and speed classes are drawn.
IUE detector saturation and the new 2800 Å absorption featre `discovered' by Karim, Hoyle, and Wickramasinghe
Savage, B. D.; Sitko, M. L.
The broad λ2800 Å absorption feature 'discovered' by Karim, Hoyle, and Wickramasingle is instrumental in origin. The feature is produced by IUE detector saturation effects in overexposed spectra.
Observations of Binaries and Evolutionary Implications
De Loore, C.
Comparison of the characteristics of groups of stars in various evolutionary phases and the study of individual systems allow to make estimates of the parameters governing mass loss and mass transfer. Observations enable us in a few cases to determine geometric models for binaries during or after the mass transfer phase (disks, rings, common envel…
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.
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…
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.…