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D/H-ratio: Observations with ORFEUS II

Werner, K.; Grewing, M.; Appenzeller, I. +12 more

During the second flight of the ORFEUS-SPAS satellite (Nov./Dec. 96) high resolution (λ/{Deltalambda} = 10,000) Echelle-spectra of BD +28^\circ 4211 in the wavelength regime 912 - 1400 Angstroms have been taken. Deuterium can be clearly identified in the ORFEUS-II Echelle-spectra of this star. For the first time it was possible to take spectra of …

The Structure of the Local Hot Bubble Toward L = 165^o, B = 0^o Using IUE and ROSAT Data

de Boer, K. S.; Kerp, J.

The first X-ray-opaque cloud in the direction of Auriga lies at 180 pc. A tenuous cloud, whose distance is derived from IUE absorption line studies as well as from an analysis of ROSAT data, is embedded at 55 pc. The X-ray emitting gas has a temperature of 10^{5.9-6.0} K. The pressure is 1.6 10^4 K cm^{-3}.

Interstellar C IV and SI IV in the Direction of Loop I

Freire Ferrero, R.

Nearby late-B and early-A stars show clear IS absorptions in Mg II, C II and other lines (IUE spectra). Some of them, in the Sco Cen direction, also show absorption features at C IV and Si IV line wavelengths. We discuss the possible formation of these lines in an intermediate temperature gas region between the dense and cold H I wall and the hot …