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COS-B gamma-ray measurements, cosmic rays and the local interstellar medium

Caraveo, P. A.; Bignami, G. F.; Strong, A. W. +6 more

The results of COS-B gamma ray, cosmic ray, and the local interstellar medium measurements are summarized, with particular regard for H I emissions at galactic longitude 240 deg. Significant quantities of atomic hydrogen are calculated from the local gamma ray emissivity, and the gamma ray emissivity spectrum is deconvolved from equations of the e…

New large-scale properties of the galactic gamma radiation observed by COS-B in the context of the diffuse emission within the galactic disc

Caraveo, P. A.; Bignami, G. F.; Hermsen, W. +7 more

IUE Spectroscopy of Dwarf M Stars

Byrne, P. B.

Far-UV wind line profile changes in the O-type star HD 175754.

Stalio, R.; Carrasco, L.; Costero, R.

Resonance line profile changes in far-UV spectra of HD 175754, obtained with the IUE satellite are reported. These changes are interpreted in terms of variations in the dynamics and density-ionization structure of the star's wind.

Ultraviolet observations of Jupiter from Earth-orbiting satellites

Moore, V.

The International Ultraviolet Explorer (IUE) has provided both improved spectral resolution and some spatial resolution for UV observations of Jupiter. Previous satellite observations have produced albedo curves for Jupiter showing the influence of Rayleigh scattering, and of some absorber(s) shortward of 2500Å on the UV spectrum. Constraints on t…

A differential measurement of the Lyman alpha emission from the giant planets using IUE

Encrenaz, T.; Combes, M.; Fricke, K. H. +1 more

The intensity of the resonantly scattered Ly-α line of the gian planets depends on the scattering column length of atomic hydrogen above the methane layer and on the incident solar flux. We have obtained measurements of the Ly-α brightness of Jupiter and Saturn on December 19, 1979, with a time difference of 111 minutes, which is only slightly lon…

Erratum - IUE Observation of Strong Ultraviolet Absorption in the Spectrum of the c2 White Dwarf L145-141

Koester, D.; Vauclair, G.; Wiedemann, V.

Observations of Interstellar CO at MM and UV Wavelengths and Diverse Comments on Interstellar Diffuse Lines

McNally, D.

The directions of stars known to exhibit the molecule CN in their interstellar spectra were searched for CO at both millimeter and ultraviolet wavelengths in order to obtain more information about moderately dense interstellar material, which is of value in ascertaining the dynamics of star formation. Results show that where both CO and CN have be…

IUE spectra of RS PUP and HD 20722 : stars in symmetric dusty nebulae.

Johnson, H. M.

Spectra obtained by the IUE satellite of the Cepheid variable RS Puppis and the K giant HD 20722, both of which are surrounded by symmetric nebula, are presented. Exposures were made in 1980 with the long wavelength redundant camera and 10 x 20 arcmin focal plane aperture at a spatial resolution of about 5 arcsec and spectral resolution about 6 A.…

Absorption Spectra of Interstellar Grains - Part Two - Fine Structure of the 2200 Hump

Chlewicki, G.; Krelowski, J.

The ultraviolet TD-1 and IUE spectra of reddened stars were analyzed in order to check the possibility of some differences in the 2200 hump profile, dependent on the spectral type or luminosity of observed stars. The profiles seem to be clearly affected by stellar parameters supporting our earlier hypotesis that this prominent UV spectral feature …