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Deuterium Abundance in the Local Interstellar Medium

Published online by Cambridge University Press:  12 April 2016

R. Ferlet ,
C. Gry  and
A. Vidal-Madjar
R. Ferlet
Affiliation:
Institut d'Astrophysique de Paris, 98bis Bd Arago, 75014, Paris, France
C. Gry
Affiliation:
IUE Observatory, Villafranca del Castillo, Appartado 54065, Madrid, Spain
A. Vidal-Madjar
Affiliation:
Institut d'Astrophysique de Paris, 98bis Bd Arago, 75014, Paris, France

Abstract

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We underline the present situation of deuterium abundance evaluation in interstellar space and show that it should be < 10-5. Studiing in more detail the λ Sco line of sight and having observed two Nal interstellar components toward that star, we can show that the D/H evaluation made toward λ Sco is in fact related to the local interstellar medium (less than 10 pc from the sun). Because this evaluation is also < 10-5 it is in stricking contrast with the one made toward α Aur (D/H > 1.8 10-5 ) confirming the fact that the deuterium abundance in the local interstellar medium varies by at least a factor of two over few parsecs.

Type
Ultraviolet and EUV Absorption Studies
Information
International Astronomical Union Colloquium , Volume 81: Local Interstellar Medium , 1984 , pp. 84 - 88
Copyright
Copyright © NASA 1984

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