Author/Authors :
Hébrard، نويسنده , , G. and Friedman، نويسنده , , S.D. and Kruk، نويسنده , , J.W and Lehner، نويسنده , , N. and Lemoine، نويسنده , , M. and Linsky، نويسنده , , J.L. and Moos، نويسنده , , H.W. and Oliveira، نويسنده , , C.M. and Sembach، نويسنده , , K.R. and Sonneborn، نويسنده , , G. and Vidal-Madjar، نويسنده , , A. and Wood، نويسنده , , B.E.، نويسنده ,
Abstract :
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.
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.
Keywords :
cosmology: observations , stars: white dwarfs , ISM: abundances , ISM: clouds , ultraviolet: ISM
