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The early-type strong emission-line supergiants of the Magellanic Clouds : a spectroscopic zoology.
Shore, S. N.; Sanduleak, N.
The results of a spectroscopic survey of 21 early-type extreme emission line supergiants of the Large and Small Magellanic Clouds using IUE and optical spectra are presented. The combined observations are discussed and the literature on each star in the sample is summarized. The classification procedures and the methods by which effective temperat…
IUE observations of longitudinal and temporal variations in the Jovian auroral emission
Skinner, T. E.; Durrance, S. T.; Feldman, P. D. +1 more
The IUE's short wavelength spectrograph has been used to monitor the auroral emissions from Jupiter's northern hemisphere, yielding eight observations between January 1981 and January 1982 of H I Lyman-alpha and the H2 Lyman and Werner bands. Attention is given to an apparent periodic emission flux fluctuation, through detailed modeling of the emi…
The Be star phenomena. II - Spectral formation and structure of envelopes
Hirata, R.; Kogure, T.
The mechanisms of formation of the continuum and line spectra of Be stars and the morphology of their cool and hot envelopes are discussed in a review of recent theoretical and observational studies, supplementing the statistical evaluation of Kogure and Hirata (1982). Topics examined include the rapid rotation of Be stars, envelope dynamics, radi…
Stellar chromospheres and coronae in the Ursa Major cluster stars.
Golub, L.; Linsky, J. L.; Simon, T. +2 more
IUE spectra of 18 proposed members of the Ursa Major Cluster and Einstein X-ray images of 11 of these stars are discussed. Thirteen stars, six in the nucleus and seven in the extended comoving stream, are probably true members of the UMa Cluster in that their bright ultraviolet and X-ray surface fluxes indicate youth. Four stars, one in the nucleu…
The detection of X-rays from nova MUSCAE 1983 with the EXOSAT satellite.
Beuermann, K.; Krautter, J.; Oegelman, H.
Nova Muscae 1983, a fast classical nova, was discovered on January 18, 1983, by Liller (1983). The present investigation is concerned with a study of this star on the basis of X-ray observations which have been conducted with the low- and medium-energy detectors of the Exosat satellite on April 20, 1984. The measured data are combined with other m…
The remarkavle kinematics of the WR wind-blown bubble RCW 58.
Smith, L. J.; Pettini, M.; Hartquist, T. W. +1 more
High resolution, high signal-to-noise ratio, ultraviolet, and optical observations of HD 96548, a WN8 star surrounded by the nebula RCW 58 which consists of stellar ejecta enclosed in a wind-blown bubble, are presented. The spectra exhibit blueshifted absorption components in a number of interstellar lines arising from a variety of ions. The veloc…
PG 1012-029 : a high-excitation eclipsing cataclysmic variable.
Green, R. F.; Liebert, J.; Penning, W. R. +2 more
The paper presents a photometric and spectrophotometric analysis of a new eclipsing cataclysmic variable, PG 1012-029, with an orbital period of 3 hr 14 minutes 18.7 s. The eclipse depth reaches 1.9 mag, is rounded at minimum, and shows a prolonged egress 'shoulder', as found for UX UMa and some other eclipsing systems. The spectrum shows strong h…
Multispectral analysis in the UV, optical and IR of HDE 245770 = A 0535+26.
Giovannelli, F.; Hensberge, H.; Persi, P. +10 more
The characteristics of the Be/X-ray binary system HDE 245770/A0535+26 are examined from UV, visual, IR and X-ray data. A sequence of observations in the optical preceding an X-ray outburst is interpreted as the ejection of a shell by the Be primary. An evolutionary scenario is presented that produces a system like HDE 245770. An effective temperat…
High-resolution, far-ultraviolet study of beta Draconis (G2 Ib-II) : transition region structure and energy balance.
Jordan, C.; Stencel, R. E.; Linsky, J. L. +2 more
High-resolution far ultraviolet spectra of the star Beta Draconis have been obtained with the IUE satellite. The observations and emission line data from the spectra are presented, the interpretation of the emission line widths and shifts is discussed, and the implications are given in terms of atmospheric properties. The emission measure distribu…
IUE UV spectra of extragalactic H II regions. I. The catalogue and the atlas.
Benvenuti, P.; Rosa, M.; Joubert, M.
More than 150 spectrograms of giant H II complexes in spiral, blue compact and irregular galaxies, excluding the Magellanic Clouds, obtained within the period March 1, 1978 and April 1, 1982 with the International Ultraviolet Explorer (IUE) in the wavelength range 1150 A to 3200 A are cataloged. Many of the observations are presented in graphic fo…