AAS 198th Meeting, June 2001
Session 59. Galactic ISM
Display, Wednesday, June 6, 2001, 10:00am-7:00pm, Exhibit Hall

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[59.19] Physical properties of the gas toward translucent cloud stars.

P. Sonnentrucker, M. Andre, S.D. Friedman (The Johns Hopkins University), B.L. Rachford, T.P. Snow (University of Colorado), D.E. Welty, D.G. York (University of Chicago)

We present far ultraviolet absorption-line measurements toward translucent cloud lines of sight obtained with the FUSE and HST-STIS instruments. These observations are part of the translucent cloud survey using FUSE (P116, Snow, 2000) and make use of the HST-STIS archival data (P8241, Lauroesch, 1999). The combined sets of data cover the range 912-1360 Å. The resolutions of 18 km/s (FUSE LWRS aperture) and 2.5 km/s (STIS E140H) allow us to derive column densities for many important gas-phase species, among which are CI, CI*, CI**, FeII, MnII, MgII, SI, CuII, ClI, ClII , CO and H2. The physical properties of the galactic gas in terms of pressure, temperature and density are derived. The elemental abundances and the CO to H2 ratio are discussed. The high-velocity gas detected in the SII, SiII, SiII*, CII, CII* lines, is studied and indicates the existence of a shock and a large-scale HII region (St-Louis and Smith, 1991).

The author(s) of this abstract have provided an email address for comments about the abstract: sonnentr@pha.jhu.edu

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