The deuterium-to-oxygen ratio in the local interstellar medium from FUSE observations

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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 its putative spatial variations. D/O is indeed very sensitive to astration, both because of deuterium destruction and oxygen production. Here, we present /DI, /OI, and /NI interstellar column density measurements performed with the Far Ultraviolet Spectroscopic Explorer (FUSE) on eight nearby lines of sight. The first results of this survey show that D/O is a better D/H proxy than D/N, and that D/O is constant in the local interstellar medium. The mean value is D/O=3.81(+/-0.18)×10-2(1σ). This result supports both D/H and O/H stability in the LISM.

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