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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…
Analysis of the far ultraviolet emission lines in late type stars.
Rego, M.; Fernandez-Figueroa, M. J.; de Castro, E. +1 more
Far ultraviolet emission lines in a sample of seven stars of spectral type later than F5 and different luminosity class have been analyzed to calculate the electron density and pressure in the formation region of the lines. Three different methods were used. We obtain electron pressures larger than solar for all dwarf stars of the sample. The low …
Ultraviolet spectrophotometry of the galactic globular cluster M5.
Altamore, A.; Capuzzo-Dolcetta, R.; Angeletti, L. +1 more
Ultraviolet low-resolution observations of M5 (NGC 5904) obtained with the International Ultraviolet Explorer (IUE) Satellite are presented. General characteristics of the spectrum are discussed. A low E(B-V) value was confirmed; some spectral features were identified as being of stellar origin. Broad- and narrow-band fluxes and their spatial dist…
The ultraviolet spectrum of the peculiar A star HD 51418.
Shore, S. N.; Adelman, S. J.
High-dispersion observations of the peculiar A star HD 51418 have been carried out in the ultraviolet by the IUE satellite. Atomic resonance lines observed in the regions 1800-2000 and 2500-3000 A include those of Mg II, Ti II, Cr I, Cr II, Mn II, Fe II and Zn II, and possibly Si II, S I, V II, Fe I, Co II, Y II, Ce II, Ce III, Eu II, Eu III and T…
Ultraviolet observations of the Be star and X-ray binary 4U 1145-61 (=HD 102567 = HEN 715) obtained with the IUE.
Hensberge, H.; Burger, M.; De Loore, C. +1 more
Two high resolution spectrograms in the range of 1150-2050 A were obtained by the IUE satellite, and from the spectrograms line lists of the stellar and interstellar absorption were compiled. The most important ions were found to be He (+); one, two and three times ionized C and Si; two and three times ionized O, three times ionized Mn; and two, t…
COS-B observations of gamma-ray emission from local galactic features
Caraveo, P. A.; Bignami, G. F.; Hermsen, W. +7 more
Evidence for large scale correlations between the high-energy photon sky and the known local distribution of diffuse interstellar matter is discussed. Evidence is presented of correlations with the Gould's Belt and the Dolidze Belt. The correlations indicate that the emission of gamma rays at medium latitudes can be explained by the distribution o…
A study of the spectrum of WZ SGE during its 1978 outburst.
Friedjung, M.
High dispersion short wavelength region IUE spectra of WZ Sge were obtained by the VILSPA tracking station near Madrid in December 1978. The profiles, both absorption and emission, are classified, and their regions of formation are considered in the framework of the standard accretion disk and excretion disk models. The C IV resonance blend is sho…
UV observations of the BL Lac object 0716+71.
Kollatschny, W.; Fricke, K. J.; Schleicher, H.
UV observations acquired by the IUE satellite of the BL Lac object 0716+71 are presented. Data were obtained in both the long- and short-wavelength ranges (2400-3000 and 1250-1900 A) and reduced using the spatially resolved line by line spectrum and the geometrically and photometrically corrected image in view of the very low signal-to-noise ratio…
IUE spectroscopy of hot binary stars HD 108,HD 149404 and HD 163181.
Hutchings, J. B.; van Heteren, J.
High-dispersion IUE UV spectra of the hot binaries HD 108, HD 149404 and HD 163181 obtained at several orbital phases is presented in an attempt to assess the influence of the companion on stellar wind outflow. Spectra of HD 108, which has an extreme Of spectrum in the visible, show velocity changes over a range of 40 km/sec in the weak absorption…
IUE spectra of the hot close binary V Pup.
Koch, R. H.; Pfeiffer, R. J.; Perry, P. M. +1 more
Low- and high-dispersion ultraviolet spectra obtained by the IUE of the early B-type close binary V Puppis are reported. The continuum derived from the low-dispersion images is consistent with a solar abundance model of effective temperature 25,000 K and log surface gravity 4.0. The high-dispersion spectra show shallow double lines, representing D…