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D/H-Ratio: Observations with ORFEUS II

Published online by Cambridge University Press:  12 April 2016

M. Gölz ,
N. Kappelmann ,
I. Appenzeller ,
J. Barnstedt ,
A. Fromm ,
M. Grewing ,
W. Gringel ,
C. Haas ,
W. Hopfensitz  and
G. Krämer
...Show all authors
M. Gölz
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie, Waldhäuserstraβe 64, D-72076 Tübingen, Germany
N. Kappelmann
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie, Waldhäuserstraβe 64, D-72076 Tübingen, Germany
I. Appenzeller
Affiliation:
Landessternwarte Heidelberg, Königsstuhl, D-69117 Heidelberg, Germany
J. Barnstedt
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie, Waldhäuserstraβe 64, D-72076 Tübingen, Germany
A. Fromm
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie, Waldhäuserstraβe 64, D-72076 Tübingen, Germany
M. Grewing
Affiliation:
Institut de Radio Astronomie Millimétrique (IRAM), 300 Rue de la Piscine, F-38406 Saint Marint d’Hères, France
W. Gringel
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie, Waldhäuserstraβe 64, D-72076 Tübingen, Germany
C. Haas
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie, Waldhäuserstraβe 64, D-72076 Tübingen, Germany
W. Hopfensitz
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie, Waldhäuserstraβe 64, D-72076 Tübingen, Germany
G. Krämer
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie, Waldhäuserstraβe 64, D-72076 Tübingen, Germany
J. Krautter
Affiliation:
Landessternwarte Heidelberg, Königsstuhl, D-69117 Heidelberg, Germany
A. Lindenberger
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie, Waldhäuserstraβe 64, D-72076 Tübingen, Germany
H. Mandel
Affiliation:
Landessternwarte Heidelberg, Königsstuhl, D-69117 Heidelberg, Germany
K. Werner
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie, Waldhäuserstraβe 64, D-72076 Tübingen, Germany
H. Widmann
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie, Waldhäuserstraβe 64, D-72076 Tübingen, Germany

Abstract

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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(ND) = 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(NH) = 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.

Type
Part III Observations and Modeling of the Local Bubble and the SXRB
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 75 - 78
Copyright
Copyright © Springer-Verlag 1998

References

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