Search Publications
Analysis of IUE observations of the galactic corona and the existence of molecular clouds in the halo
Hartquist, T. W.; Tallant, A.
IUE observations of ions in the galactic corona are reanalyzed and Savage and de Boer's (1979) conclusion that the detected hot phase has a temperature proportional to 80,000 K is confirmed. The cold phase must be at a temperature of less than 24,000 K and probably contains substantial amounts of molecular material. Molecules, such as CH(+), OH an…
Anomalous far-uv extinction in the WN 6 star HD 147419.
Willis, A. J.; Stickland, D. J.
IUE observations of two WN stars in ring nebulae, HD 147419 and HD 89358, show that in the former star, the level of far UV interstellar extinction, λ > 1600 Å, is far higher than expected from the mean galactic extinction law. The derived scale of extinction for HD 147419, Aλ/EB-V, agrees well with the mean galactic law at λ > 16…
IUE observations of high-velocity components in spectra of beta Orionis.
Bates, B.; Giaretta, D. L.; Brown-Kerr, W.
The high dispersion spectrum of R CrB in the long wavelength obtained near its maximum with the International Ultraviolet Explorer shows the presence of chromospheric Mg II emission. For comparison the spectrum of γ Cyg was obtained immediately afterwards. The Mg II emission width of R CrB is found to be the same as that of γ Cyg.
Molecules in celestial objects. II. IUE observations of CO towards psi Per (B5 Ve).
Tarafdar, S. P.; Swamy, K. S. K.
Absorption features corresponding to 1-0, 2-0, 3-0 and 4-0 bands of the A-X transition of CO have been identified in the spectra of a hot shell star, Psi Per (B5 Ve, E(B-V)=0.09). Arguments are put forward to suggest its possible origin in the circumstellar shell.
Coordinated optical, ultraviolet, radio and X-ray observations of SN 1979c in M 100.
Tarenghi, M.; Panagia, N.; Parmar, A. N. +24 more
Coordinated optical, ultraviolet, radio and X-ray observations of supernova 1979c in M 100 made in the first six weeks after its discovery are presented and discussed. On the basis of optical data, which indicate a maximum magnitude of -19.4, a decay rate of 0.046 magnitudes/day, a total radiative energy of 7 x 10 to the 49 erg, and optical lines …
Detailed ultraviolet observations of the quasar 3C 273 with the IUE.
Tarenghi, M.; Perola, G. C.; Boksenberg, A. +17 more
The paper analyzes the nine spectra of the quasar 3C 273 obtained with the International Ultraviolet Explorer in order to combine them and to obtain a high signal-to-noise spectrum between 1100 and 3300 A. An analysis was then made of the emission line intensity ratios and of the continuous energy distribution; evidence was found for thermal contr…
Spectrophotometry of dwarf novae in the wavelength range of 1250-7500A.
Pringle, J. E.; Bath, G. T.; Whelan, J. A. J.
The paper presents spectrophotometric observations of three southern dwarf novae BV Cen, EX Hya and VW Hyi in the wavelength range 1250-7500 A. BV Cen and EX Hya were observed in quiescence and VW Hyi on the decline from outburst. The received energy flux for BV Cen peaks at visible wavelengths, where the spectrum of a late G-star is evident. Both…
Ultraviolet spectra of planetary nebulae. I. The abundance of carbon in IC 418.
Harrington, J. P.; Lutz, J. H.; Seaton, M. J. +1 more
IUE observations of IC 418 give fluxes in the lines C III λ1908, C II] λ2326, [O II] λ2470 and Mg II λ2800. Fluxes on the scale of F(Hβ) = 100 are obtained using a computed [O II] branching ratio F(λλ7320,30)/F(λ2470) and an observed ratio F(λλ7320, 30)/F(Hβ). The deduced carbon abundance is log {C} = 8.85 ± 0.2 compared with log {C} = 8.67 ± 0.1 …
The UV spectrum of AE Aqr.
Jameson, R. F.; King, A. R.; Sherrington, M. R.
Ultraviolet spectra of the cataclysmic variable AE Aquarii obtained by the IUE satellite are reported. They show strong emission lines on a weak continuum. It is shown that while Mg II, Ca II and some L-alpha emission probably arise in optically thin regions of the accretion disc, the higher ionization species must be radiatively produced outside …
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…