Paper:	HD in the Galactic ISM
Volume:	348, Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE
Page:	100
Authors:	Lacour, S.; Andre, M.K.; Sonnentrucker, P.; LePetit, F.; Welty, D.E.; Desert, J.-M.; Ferlet, R.; Roueff, E.; York, D.G.
Abstract:	We present column density measurements of the HD molecule in the interstellar gas toward 17 heavily reddened Galactic sightlines. Seven are derived from observations with FUSE, and ten are reanalysis of spectra obtained with Copernicus. Comparisons of the column densities HD, CH, CN, and K I in these 17 sightlines indicate that HD is most tightly correlated with CH. Stringent lower limits to the interstellar D/H ratio, derived from the HD/2H2 ratio, range from 3.7×10−7 to 4.3×10−6. Our results also suggest that the HD/H2 ratio increases with the molecular fraction f(H2).

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