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HD 149499B : the hottest white dwarf ?
Wray, J. D.; Parsons, S. B.; Henize, K. G.
IUE spectra of the white dwarf component of HD 149499, discovered from the Skylab experiments S-019 UV survey, show prominent lines of He II. The star appears to be helium-rich with He/H not less than 1. The ultraviolet fluxes show the temperature to be within the range 70,000-100,000 K, with the most probable value near 85,000 K.
On the ultraviolet spectrum of Nova Cygni 1978.
Clavel, J.; Macchetto, F.; Cassatella, A. +4 more
Ultraviolet high- and low-resolution spectra of Nova Cygni 1978 have been obtained with IUE at three dates during the first month after its outburst (Sept. 13). The high-resolution spectrum of Sept. 28 is dominated, in the range 2300-2800 A, by broad undisplaced emission lines of singly ionized metals like Fe II, Cr II, and Mn II. The widths of th…
IUE observations of the extreme B1 supergiant zeta 1 Sco.
Wolf, B.; Appenzeller, I.
High-resolution (delta lambda approximately 0.2 A) and low-resolution (delta lambda approximately 6 A) spectrograms in the wavelength range from about 1200 to 3200 A have been obtained using the IUE satellite. The high-dispersion spectrograms have been used to compile lists of the stellar and interstellar absorption lines and to derive accurate wa…
Gas, dust, high energy particles and star formation in the Galactic Center
Puget, J. -L.; Lequeux, J.; Audouze, J. +1 more
The amount of gas and dust in the Galactic Center is evaluated. The COS-B and SAS-2 gamma-ray observations of the Galactic Center are discussed and limits for the flux of high-energy cosmic rays are derived from them. Consideration is given to low-energy cosmic rays which are indirectly responsible via their interaction of the interstellar matter,…
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…