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Interstellar D/H on the Sightline of Sirius

Published online by Cambridge University Press:  25 May 2016

G. Hébrard ,
A. Vidal-Madjar ,
R. Ferlet ,
C. Mallouris ,
D. York  and
M. Lemoine
G. Hébrard
Affiliation:
Institut d'Astrophysique de Paris, CNRS, 98 bis boulevard Arago, F-75014 Paris, France
A. Vidal-Madjar
Affiliation:
Institut d'Astrophysique de Paris, CNRS, 98 bis boulevard Arago, F-75014 Paris, France
R. Ferlet
Affiliation:
Institut d'Astrophysique de Paris, CNRS, 98 bis boulevard Arago, F-75014 Paris, France
C. Mallouris
Affiliation:
Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA
D. York
Affiliation:
Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA
M. Lemoine
Affiliation:
DARC, Observatoire de Paris-Meudon, UPR-176 CNRS, F-92195 Meudon Cédex, France

Abstract

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We present observations of the binary Sirius A / Sirius B performed with HST-GHRS. Two interstellar clouds are detected on this sightline, one of them being identified as the Local Interstellar Cloud (LIC). Lyman α interstellar lines are also observed, but whereas the deuterium Lyman α line is well detected in the LIC with an abundance in agreement with that obtained by Linsky et al. (1995), no significant D i line is detected in the second cloud. The deuterium abundance which we measured in this cloud is 0 < (D/H)ism < 1-6 × 10−5. Despite the large error bar, this sightline appears consequently as a good candidate for a low (D/H)ism.

Type
3. Abundances of D, 3He and 4He
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 236 - 237
Copyright
Copyright © Astronomical Society of the Pacific 2000 

References

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