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A survey of MG II H and K emission in near-solar-type stars.
Doherty, L. R.
IUE measurements of Mg II h and k emission fluxes are presented for 30 F and G stars that are on or near the main sequence and compared with Wilson's measurements of the Ca II H and K fluxes in these stars. The survey includes a large proportion of stars with very low chromospheric activity as well as 111 Tau, χ1Ori and other examples o…
Discovery of the hot companion to the two-day cepheid HD 129708.
Arellano Ferro, A.; Madore, B. F.
The Cepheid HD 129708 has been observed with the International Ultraviolet Explorer satellite, and a hot companion star (B4-5) has been discovered. Comparison of the observed energy distribution with theoretical atmosphere models gives Te = 16,000±1000K and log g = 4.0±0.5 for the hot companion. A visual magnitude difference ΔV = 2…
The ultraviolet absorption spectrum of NGC 4151.
Tarenghi, M.; Veron, P.; Veron-Cetty, M. P.
The analysis of all available low dispersion, short wavelength, large aperture IUE spectra of NGC 4151 taken prior to March 1982 shows a linear correlation between the depth of the absorption lines and the strength of the underlying emission; the absorption lines vanish while the continuum is still measurable. This is interpreted as being due to a…
The final COS-B database now publicly available
Caraveo, P. A.; Bignami, G. F.; Hermsen, W. +7 more
The data obtained by the gamma-ray satellite COS-B have been processed, condensed and integrated together with the relevant mission and experiment parameters into the "Final COS-B Database". The database contents and the access programs available with the database are outlined. The final sky coverage and a presentation of the large-scale distribut…
On the coronae of rapidly rotating star. V. The other stars.
Walter, F. M.
Results of Einstein X-ray observations of 25 stellar systems are presented. The systems observed include 15 spectroscopic binaries of which eleven were detected; nine were serendipitous detections, three of which may be new RS CVn systems. Coronal activity levels and their implications for these stars are discussed.
Properties of dust in the Orion nebula.
Patriarchi, P.; Perinotto, M.
New observations of the Orion nebula very close to the Trapezium stars have been taken with the IUE satellite in order to improve knowledge of the dust properties in the nebula. The new data have been interpreted together with previous observations using multiscattering models with various distributions of the dust-to-gas ratio. The main result is…
An interpretation of the spectral variations of theta Coronae Borealis.
Underhill, A. B.
Measurements are presented of the strengths and displacements of sharp absorption components of the resonance lines of Si IV, C IV, and Al III in the spectrum of θ CrB. No evidence is found for mass loss at a detectable rate. A qualitative model of a Be star is developed. It is suggested that the spectral variations of θ CrB are the result of chan…
Numerous Blended Fev Fevi Emission Lines Identified in the Ultraviolet Spectrum of the WN6 Star HD192163
Nugis, T.; Sapar, A.
X-ray emission from the cataclysmic variable PG 0834+488.
Cook, M. C.
A 5-hr observation of PG0834+488 using the EXOSAT X-ray observatory has resulted in its detection as an X-ray source. The light curve shows marginal evidence for variability but no coherent periodicities were found. The X-ray spectrum was hard, with a photon index of ≡1.36, and the low-energy absorption implied a low column density NH ≡…
Evidence for supermassive stars in three Seyfert galaxy nuclei from IUE spectra.
Stoner, R.; Ptak, R.
The variability in the ultraviolet continua and the C IV 1550 A emission profiles in the three Seyfert 1 galaxies NGC 4151, NGC 5548, and Fairall 9 are consistent with origin in supermassive stars undergoing explosive mass loss. Blackbody fits to continua of each imply a single thermal source whose area either remains constant or increases moderat…