Abstract

Observations made with the Interstellar Medium Absorption Profile Spectrograph (IMAPS) on the US-German ORFEUS-SPAS II mission in late 1996 provide the first new measurements of Galactic interstellar atomic deuterium beyond the local ISM since the Copernicus mission in the 1970s. IMAPS is an objective grating echelle spectrograph designed for high spectral resolution in the far UV (see Jenkins et al., 1996). IMAPS observed δ Orionis A (09.5 II), γ2 Velorum (WC8+O9I), and ζ Puppis (O4 Iaf) at a spectral resolution of 4 km s-1 over the range 930–1160 A, including H I Ly-δ (949.485 A) and Ly-e (937.548 A).

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