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Ultraviolet, visible, infrared and X-ray observations of SCO X-1.
Davis, R. J.; Willis, A. J.; Wilson, R. +18 more
The first UV spectroscopic observations of the X-ray source Scorpius X-1, obtained with the IUE satellite, are presented. The UV data consist of low-resolution spectra in the 1150-3200 A wavelength range, and show emission lines arising in Si II and IV; C III and IV; N III, IV, and V; O IV and V, and He II. Also discussed are observations using vi…
IUE observations of the UV spectrum of comet Bradfield
Feldman, P. D.; A'Hearn, M. F.; Weaver, H. A. +6 more
Comet Bradfield (1979l), discovered shortly after perihelion, on Christmas day 1979, is characterized by a retrograde orbit of period ~250yr. This orbit was very favourable for observation by the IUE satellite1, and the first observations, the preliminary results of which are reported here, were made on 10 and 11 January 1980. Previousl…
Outer atmospheres of cool stars. III. IUE spectra and transition region models for alf CEN A and B.
Linsky, J. L.; Ayres, T. R.
We describe lUE ultraviolet spectra of two nearby dwarf stars, α Centauri A (G2 V) and B (K1 V). These data include high-resolution profiles of the Mg II h and k features and lower- resolution integrated fluxes of lines from the following species: H I, C I-IV, N V, O I, A1 II, Si II-IV, and Fe II. We find that surface fluxes in chromospheric and t…
Spatial imaging of hydrogen Lyman-alpha emission from Jupiter
Feldman, P. D.; Moos, H. W.; Weaver, H. A. +3 more
A sounding rocket measurement of the H I L-alpha emission from Jupiter made on Dec. 1, 1978 shows limb darkening and an average disk brightness of 13 kR. This brightness is significantly higher than in previous measurements, and was confirmed by an IUE observation on Dec. 10, 1978. Comparison with a plane-parallel hydrogen layer model indicates th…
Carbon in Comet Bradfield 1979l
Feldman, P. D.; A'Hearn, M. F.
Ultraviolet spectra of comet Bradfield obtained with IUE show a surprising absence of CO(+) despite the presence of CO2(+), and they also show, for the first time, the unambiguous presence of the Mulliken bands of C2. With the use of simultaneous ground-based data, a value of 0.00001 is derived for the transition moment of the a 3 Pi-X 1 Sigma g +…
IUE and ground based observations of the LMC star S Dor.
Wolf, B.; Cassatella, A.; Appenzeller, I.
IUE and ground-based spectrograms of the luminous Hubble-Sandage variable S Doradus of the Large Magellanic Cloud are presented. The two low-resolution IUE spectrographs covering the range 1150-3100 A are found to be dominated by strong absorption features of singly ionized metallic lines, with the resonance lines of C IV at 1548 and 1551 A and of…
Simultaneous X-ray, UV, and optical observations of the recent nova HR Del.
Hutchings, J. B.
HR Del was observed simultaneously with the IUE satellite (low-dispersion spectroscopy), the DAO 1.8-m telescope (medium-dispersion spectroscopy), and the Einstein observatory (X-ray imaging proportional counter) over part or all of one 4-hour orbital cycle. The orbital ephemeris is refined and accurate phases computed for the data. The UV spectra…
IUE observations of interstellar SI IV and C IV lines observed in thespectra of Wolf-Rayet stars.
Willis, A. J.; Wilson, R.; Smith, L. J.
Recent IUE observations of Wolf-Rayet stars show narrow absorption lines in the highly ionized species of Si IV and C IV. These are observed in the spectra of 10 WR stars which are being studied as part of an extensive investigation of this stellar class with the IUE satellite. The strengths of the sharp Si IV and C IV undisplaced absorption lines…
Observations of the spectrum of Jupiter from 1500 to 2000 A with the IUE
Owen, T.; Caldwell, J.; Lane, A. L. +5 more
The paper examines the far-UV spectrum of Jupiter recorded by observations with the International Ultraviolet Explorer, noting that only the upper levels of the plant's atmosphere are sampled. It is shown that there are several absorptions caused by C2H2 and indications that NH3 may also be present at these altitudes. In addition, it is suggested …
IUE UV spectra of giant extragalactic H II regions.
Rosa, M.
The UV spectra (wavelengths between 1200 and 3200 A, resolution of 6 A) of the two extragalactic H II regions NGC 604 and NGC 5471 have been observed with the IUE satellite. The spectra show a continuum energy distribution and absorption lines (often with P Cygni profiles) characteristic of luminous early type stars, with a weak nebular emission s…