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Active stars and systems
Rodono, M.
The most notable manifestations of stellar activity are reviewed with particular emphasis on the merging picture of solar-type activity in physical conditions different from those in the Sun. Evidence for starspots, plages and high-level coronal emissions is presented from observations covering a wide range of spectral bands: from X-ray to radio w…
X-ray diagnostics of globular clusters
Grindlay, J. E.
The presence of compact X-ray sources in globular clusters allows diagnostic studies of both the X-ray sources themselves and the globular clusters to be carried out. A review of much of this work, primarily based on Einstein X-ray observations and supporting studies of globular clusters at radio through UV wavelengths, is presented. The compact X…
IUE observations of globular clusters and blue horizontal branch stars
Code, A. D.
This paper presents a review of ultraviolet photometry and spectroscopy of globular clusters and blue horizontal branch stars. Current observations with IUE are placed within the framework of earlier photometric studies carried out by OAO and ANS. In order to provide basic information on the nature of the horizontal branch star, whose light domina…
IUE observations of supernova remnants
Raymond, J. C.
Ultraviolet spectra of supernova remnants obtained with the IUE satellite provide unique information concerning the shock conditions and elemental abundances in the optically bright filaments. High temperature species such as N V provide diagnostics for shock velocities above 100 km s-1, and strong lines of carbon and silicon in the IUE…
High luminosity X-ray binaries: IUE results
Hutchings, J. B.
The contribution of UV spectroscopy to the understanding of massive X-ray binaries, is reviewed. Results are given in the context of normal stars and binaries. The IUE results have enabled a greater understanding of the effects of accretion disks and X-ray heating in the systems, and provide absolute fluxes and luminosities. High-dispersion data r…
IUE and Einstein observations of supernovae
Palumbo, G. G. C.
In this paper IUE observations of two type II and three type I Supernovae (see Table I and Table II) are reviewed. The type II events were also observed by Einstein and SN 1980k was detected in the soft X-ray energy band. Combining UV spectra available of the same events one has the elements to construct a physical picture which accounts for all o…
IUE observations of cataclysmic variables
Szkody, P.
The four years of IUE operation have revealed that the ultraviolet region of the spectrum contributes a dominant share of the emerging energy from cataclysmic variables and provides important clues to the physical nature of these systems. The implications of the continuum flux distributions and line spectra for the determination of the accretion r…
IUE observations of hot stars
Conti, P. S.
Stellar winds are found in hot and luminous stars of all types. We see evidence of these winds in P Cygni profiles of resonance lines in the UV spectral regions, and obtain density information from them, and from optical emission lines and from free-free radiation in the infrared and radio continua from the ionized plasma. Data recently acquired f…
I.U.E. high resolution observations of hot stars emitting coronal x-rays
Bianchi, Luciana
The far UV resonance lines of a sample of 21 early-type stars, which were observed in the soft X-Ray band with the Einstein satellite, are examined using I.U.E. high resolution spectra to search for possible correlation between the X-Ray coronal emission and far UV spectral properties. In particular, those quantities that can give information on t…
Observational aspects of chromospheres and coronae in hot stars
Stalio, R.
With the advent of high resolution space observations with high sensitivity, stellar atmospheric research has entered a new phase of rapid development. All stars, and especially hot stars, are now recognized to have atmospheric characteristics that were not suspected before. All hot stars that we can observe with sufficient accuracy show chromosph…