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The line spectrum of the Fe II Seyfert I galaxy AKN 120
Kollatschny, W.; Yorke, H. W.; Fricke, K. J. +1 more
Combined UV and optical spectra are presented for the Fe II Seyfert galaxy Akn 120. The galaxy shows unusually strong Ly-alpha and UV Fe II emission, as well as a jump in the continuum at 3000-4000 A. The spectra are obtained with the IUE satellite telescope in both the short and long wavelength regions. Also discussed is an optical spectrum which…
The 1979-1980 eclipse of ZET Aur. II. The emission spectrum.
Stencel, R. E.; Chapman, R. D.
UV observations using the IUE are employed to discuss the strength and changes of Zeta Aur between a second contact and mid-eclipse in 1979, the relative visibility of the supergiant's chromosphere as compared with the circumstellar (CS) nebular scattering of the B star photons, and the origin of the high speed CS components observed at all orbita…
High velocity interstellar C IV and SI IV toward two stars in the I Per OB association.
Gondhalekar, P. M.; Phillips, A. P.
Blue-shifted interstellar C IV, Si IV and Al III lines have been detected in the IUE spectra of the B2Ia stars HD 14818 and HD 14143; which are members of the I Per OB association. The radial velocities and column densities of these high ion state lines are similar toward the two stars. These observations, together with previous optical and radio …
Outburst spectra of UZ Ser.
Jones, D. H. P.; Pringle, J. E.; Hassall, B. J. M. +4 more
August-1980 observations of UZ Ser in outburst and approaching quiescence are presented. Spectral fits to simultaneous ultraviolet and optical data in the wavelength range 1250-8000 A are examined. An upper limit of the reddening E(B-V) = 0.1 mag is found, and the ultraviolet spectrum at outburst is observed to show broad shallow absorption lines.
Far UV observations of late K and M type stars.
Stickland, D. J.; Sanner, F.
The far UV spectra of 15 late K and M type giant and supergiant stars have been recorded with IUE. They exhibit rather flat continua which change strength with spectral type and appear to originate in the low chromosphere. A number of chromospheric emission lines have also been measured and identifications are suggested for many of them.
IUE observations of the high redshift QSO 1101-264.
Boksenberg, A.; Snijders, M. A. J.
Low-resolution spectral observations of the high-redshift quasar Q 1101 obtained by the IUE satellite are presented. Low-dispersion observations were obtained in the spectral regions 1150-1950 A and 1850-3350 A, and reduced by the improved extraction method of Snijders (1980). The quasar is found to be 18 + or - 5% brighter in the long-wavelength …
Far-ultraviolet observations of the variable radio star LS I +61 303.
Maraschi, L.; Tanzi, E. G.; Treves, A.
One short wavelength spectrum, 1200-1950 A, and two long wavelength spectra, 1900-3200 A, have been obtained from IUE observations of the radio star LSI plus 61 deg 303 in September 1980. Assuming an E(BV) value of 0.9, as given by the rectification of the 2200 A absorption dip, the ultraviolet continuum is found to be fitted by a model atmosphere…
UV spectroscopy of planetary nebulae.
Perinotto, M.; Benvenuti, P.
The planetary nebulae IC 2149 and NGC 2440, 3242, and 6826 are investigated with spectra obtained using the IUE satellite in the spectral range 1150-3200 A at a resolution of 7 A. The physical conditions in the nebulae are derived, as are the abundances of C, N, O, and Ne. It is noted that carbon is essentially solar while nitrogen appears slightl…
IUE monitoring of the spatial distribution of the H Ly-alpha emission from Jupiter
Feldman, P. D.; Moos, H. W.; Clarke, J. T.
North-south spatial maps of the Jovian H Lyman-alpha emission observed with the IUE satellite support the identification of a marked longitudinal asymmetry in the equatorial brightness, with the peak around lambda III(1965) = 50-100 deg longitude, and show a weaker planet-wide equatorial brightening above the level predicted by a plane-parallel la…
The ultraviolet spectrum of the planetary nebula NGC 6572.
Flower, D. R.; Penn, C. J.
The ultraviolet emission line spectrum of NGC 6572 has been analyzed in conjunction with visual and infrared observations of the nebula. Particular attention is paid to the C/O abundance ratio for which a value of 1.1 is derived. Gaseous Mg is found to be depleted in the outer regions of the nebula.