D/O and D/H ratios in the local interstellar medium from FUSE observations

Details D/O and D/H ratios in the local interstellar medium from FUSE observations D/O and D/H ratios in the local interstellar medium from FUSE observations

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ap%26ss.289..225h&link_type=abstract

Astrophysics and Space Science, v. 289, Issue 3, p. 225-228 (2004).

Astronomy and Astrophysics

Astrophysics

Ism: Abundances, Ism: Clouds, Ultraviolet: Ism

Scientific paper

Since HI, OI, and DI have nearly the same ionization potential, the deuterium-to-oxygen ratio (D/O) is an important tracer of the D/H ratio and of its putative spatial variations. D/O is indeed very sensitive to astration, both because of deuterium destruction and oxygen production. Moreover, D/O measurements are less subject to systematic errors than D/H.A survey of D/O in the interstellar medium is performed by the Deuterium Working Group of the FUSE PI Team. The first results show that D/O is a better D/H proxy than D/N, and that D/O is homogeneous in the local interstellar medium, at least within about 100pc. The stability of D/O appears as a strong argument which supports both D/H and O/H spatial stability in the local interstellar medium.

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