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The ultraviolet spectrum of the X-ray source 2A 0526-33.
Bonnet-Bidaud, J. M.; Mouchet, M.; Ilovaisky, S. A. +1 more
Low resolution spectra of the X-ray source 2A0526-33 have been obtained with IUE. The X-ray source 2A0526-33 is confirmed as a cataclysmic variable from both its line and continuum ultraviolet spectra. Observed emission lines are similar to those found in other systems, such as EX Hya (Bath et al., 1980), AM Her or SS Cyg at quiescence (Fabbiano e…
Theoretical and observed UV energy distributions of 7 globular clusters
Nesci, R.
A grid of synthetic UV spectra is computed and the effects of the various parameters are shown. A comparison with the integrated spectra of 7 globular clusters is made with satisfactory results, suggesting that constraints on the HB morphology and the chemical composition may be achieved on the basis of the UV fluxes alone. A spread in the observe…
An ultraviolet study of NGC 7662.
Perinotto, M.; Benvenuti, P.
Spectroscopic observations obtained by the IUE of the planetary nebula NGC 7662 are discussed. Physical conditions in the central regions of the nebula are determined from the intensities of the O III and Ne IV lines, resulting in an electron temperature profile which increases with the ionization potential of the ions, in agreement with predictio…
The ultraviolet spectrum of the high redshift QSO B2 1225+31.
Boksenberg, A.; Snijders, M. A. J.; Pettini, M.
We present low-resolution, near-ultraviolet observations of the bright (V=15.87), high redshift (Zem ≈ 2.2) QSO B2 1225+31, obtained with the IUE long wavelength camera. These spectra provide an important extension to the large body of optical and radio work carried out on this object. The QSO continuum in the ultraviolet agrees well wi…
Lanning 10 and 33 : the X-ray, uv, and optical fluxes.
Szkody, P.; Crosa, L.
UV spectra from IUE, optical spectroscopy, broad band photometry, and upper limits on the X-ray flux from Einstein are used to specify the characteristics of Lanning 10 and 33. Data on Lanning 33 are consistent with a 22,000 K Be star at a distance of 5 to 7 kpc, and Lanning 10 appears to include a F5-G0 star plus a hot component greater than 35,0…
Boron and beryllium in early-type peculiar stars.
Sadakane, K.; Jugaku, J.
High-dispersion ultraviolet spectra of eleven early-type peculiar stars have been obtained with the IUE. The B II resonance line at 1362.46 Å is clearly present in two Mn-Hg stars (κ Cnc and HR 7.361) and in 20 Tao, while the presence of this line cannot be confirmed in the remaining eight stars. The B II subordinate lines near 1624 Å and the B II…
IUE observations of four planetary nebulae.
Johnson, H. M.
Low dispersion spectra of NGC 6905 and NGC 5189 are reproduced. These are nebulae with 'O VI sequence' nuclei. Line features are identified and classified according to site in the nucleus or the nebula; their flux densities are measured above continuum and presented before and after correction for interstellar extinction. The behavior of the line …
Phase-dependent optical and ultraviolet observations of the old nova V603 AQL (1918).
Drechsel, H.; Krautter, J.; Rahe, J. +1 more
Continuous photometric and ultraviolet spectroscopic observations of the old nova V 603 Aql (1918) were simultaneously carried out with the IUE satellite. Periodic visible light variations with an amplitude of about 0.3 m were discovered, and an orbital period of 3h18.3m was derived. The UV spectroscopy revealed strong variations of the emission l…
Detection of Lyman continuum absorption in the BL Lacertae object PKS0735+178.
Huggins, P. J.; Bregman, J. N.; Glassgold, A. E.
The detection of the Lyman edge in the BL Lac object PKS 0735+178 at the absorption red shift determined by optical measurements leads to a lower limit for the column density of atomic hydrogen, N(H I) not less than 4(17)/sq cm. The Lyman-alpha absorption line appears to have been detected, but only an approximate upper limit can be obtained from …
The abundance of carbon in HU 2-1.
Lutz, J. H.
A logarithmic carbon abundance of 8.61 + or - 0.3 is derived for the planetary nebula Hu 2-1 using data taken with the International Ultraviolet Explorer satellite. This value is close to the logarithmic carbon abundance of 8.67 + or - 0.1, found for the sun by other investigators. The carbon abundance of Hu 2-1 is compared to those of other plane…