Deuterium and the local interstellar cloud(s?)

Details Deuterium and the local interstellar cloud(s?) Deuterium and the local interstellar cloud(s?)

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...155..407v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 155, no. 2, Feb. 1986, p. 407-412.

Astronomy and Astrophysics

Astrophysics

26

Absorption Spectra, Abundance, Deuterium, Interstellar Gas, Interstellar Matter, Ultraviolet Spectra, Calcium, Line Of Sight, Morphology, Sodium

Scientific paper

The authors underline the present situation of deuterium abundances evaluation in interstellar space, which seems to vary from one direction to another. Studying in more detail the λ Sco line of sight and having observed two Na I and Ca II interstellar components toward that star, they can show that the D/H evaluation made toward λ Sco is in fact related to the local interstellar medium (less than 15 pc from the sun). Because this evaluation is also ≤10-5, it is in striking contrast with that 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 a few parsecs. Strong evidences are also given for the presence of two clouds or for a complicated interstellar morphology in the immediate vicinity of the solar system.

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