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Short time changes in the terminal velocity of the stellar wind of alpha Cam ((O9.5 Ia).
Macchetto, F.; Lamers, H. J. G. L. M.; de Jager, C. +1 more
The UV spectrum of the star Alpha Cam (09.5 Ia) was observed for 72 hours continuously in September 1978, with IUE. During these three days the star shows gradual short-term changes of the edge velocity of the C IV and N V resonance lines. The change is largest for the lines formed at large distance from the star, and may be due to either UV-flux …
The ultraviolet spectrum and expansion velocity of eta Carinae from IUE observations.
Viotti, R.; Cassatella, A.; Giangrande, A.
Sunmary. The high resolution ultraviolet speotrum of Car was observel with lUE on May 22 ani 2 , 1978. High (civ, SiIV, FeIli, ani probably NV) and low ionization (Mgi, MgII, MnII, AllI, Fell, eto.) lines have been identified with absorption and/or emission oomponents. Most resonance lines have three absorption components, the interstellar line, a…
The satellite-UV spectrum of S CrA.
Wolf, B.; Appenzeller, I.
The ultraviolet spectrum (1200 to 3000 A) of the bright YY Orionis star S CrA has been observed by means of the International Ultraviolet Explorer (IUE) satellite. The strongest spectral features are identified as emission lines of C I, Mg II, Si II, Si III, C IV and Si IV and as absorption blends of Fe II, Cr II, Mn II, Ni II, Zn II and V II. Usi…
The "semitorrid" gas observed in the direction of gamma 2 Velorum and the Gum nebula.
Bruhweiler, F. C.; Kondo, J.; McCluskey, G. E., Jr.
On the basis of recent IUE observations in the far-ultraviolet, the authors report the detection of a 'semitorrid' region of the interstellar medium in the direction of Gamma-2 Velorum and the Gum nebula. The characteristic temperature of this gas is in the 40,000 K range, between the warm (around 1000 K) and hot (roughly 100,000-1,000,000 K) regi…
The stellar wind and the UV spectrum of (nova) HR Delphini.
Hutchings, J. B.
Low-resolution ultraviolet spectra of HE Del have been obtained with the IUE satellite. The continuum matches a high g stellar atmosphere with Teff ∼ 15,000 K, EB-V ∼ 0.2. However, the line spectrum contains resonance features of high ionization, with P Cygni profiles indicating outflow at more than 2300 km s-1 fro…
The [Ne IV] 2D -> 4S lines in the planetary nebula NGC 7662.
Lutz, J. H.; Seaton, M. J.
Results are reported for high-resolution IUE satellite observations of the 2p 3 2D 3/2 - 4S, 2D 5/2 - 4S UV forbidden lines of Ne IV in the spectrum of NGC 7662. Precision measurements of the wavelengths are obtained, along with an improved determination of Ne IV doublet-quartet separations, a measurement of the intensity ratio for the forbidden N…
IUE observations of the symbiotic star CH Cygni during an active phase
Hack, M.
THE spectrum of CH Cygni usually has the appearance of a normal M6 III star, but at intervals of several years, it has outbursts during which it shows the characteristics of a symbiotic star, that is a blue continuum extending shortward of the B almer discontinuity, and emission lines of He I, Fe II, [Fe II], [S II], [O III]; the Balmer lines and …
The ultraviolet spectrum of LSI +61 303.
Hutchings, J. B.
IUE spectroscopy is presented of the radio variable emission-line star LSI +61°303, which may also be a source of X and γ rays. The UV continuum is complex and dues nut fit a single stellar model or power law. The UV flux and line spectrum suggest the primary is a mass-losing Ib supergiant but all possibilities involve some peculiarities compared …
Gamma rays from the Cygnus region and the nature of CG 78+1.
Strong, A. W.; Wolfendale, A. W.; Protheroe, R. J.
Interpretation of the galactic gamma-ray flux above 100 MeV has been complicated by the presence of a component due to 'point' sources of gamma-rays and by the lack of measurements of the molecular hydrogen (except along the galactic equator) which forms a large fraction of the interstellar medium (ISM). Recent CO observations of the Cygnus X regi…
The UV spectrum of VV Cep in 1978.
Faraggiana, R.; Selvelli, P. L.
VV Cep spectra taken by IUE in June and July 1978 are examined. At this initial phase of the chromospheric eclipse following the totality of the 1977 eclipse, the chromospheric line spectrum is well developed in the region 2500-3000 A, superimposed on the spectrum of the hot companion. The flux distribution derived from the low-resolution and larg…