D/H-Ratio: Observations with ORFEUS II

During the second flight of the ORFEUS-SPAS satellite (Nov./Dec. 96) high resolution (λ/∆λ = 10,000) Echelle-spectra of BD+28° 4211 in the wavelength regime 912–1400 Å have been taken. Deuterium can be clearly identified in the ORFEUSII Echelle-spectra of this star. For the first time it was possibl...

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Bibliographic Details
Published in:International Astronomical Union Colloquium 1997, Vol.166, p.75-78
Main Authors: Gölz, M., Kappelmann, N., Appenzeller, I., Barnstedt, J., Fromm, A., Grewing, M., Gringel, W., Haas, C., Hopfensitz, W., Krämer, G., Krautter, J., Lindenberger, A., Mandel, H., Werner, K., Widmann, H.
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Language:English
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Summary:During the second flight of the ORFEUS-SPAS satellite (Nov./Dec. 96) high resolution (λ/∆λ = 10,000) Echelle-spectra of BD+28° 4211 in the wavelength regime 912–1400 Å have been taken. Deuterium can be clearly identified in the ORFEUSII Echelle-spectra of this star. For the first time it was possible to take spectra of faint, not redshifted objects in the far ultraviolet with a sufficient spectral resolution to study the deuterium column density in the whole spectral range of the Lyman-series down to the Lyman-limit. We obtained a value of log(N D ) = 14.7 (±0.3) towards BD+28° 4211. The hydrogen column density has been determined using ORFEUS Echelle- and IUE -spectra of Ly- α (log(N H ) = 19.8 (±0.2)). Thus a value of 8 × 10 −6 can be obtained for the D/H-ratio on the line-of-sight towards BD+28° 4211.
ISSN:0252-9211
DOI:10.1017/S0252921100070755