FUSE and STIS Study of the Physical Conditions in the Gas Toward HD185418.

Details FUSE and STIS Study of the Physical Conditions in the Gas Toward HD185418. FUSE and STIS Study of the Physical Conditions in the Gas Toward HD185418.

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.6509s&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #65.09; Bulletin of the American Astronomical Society, Vol. 33, p.1408

Astronomy and Astrophysics

Astronomy

Scientific paper

We present far ultraviolet absorption-line measurements toward the candidate translucent cloud star HD185418. The analysis was performed combining the FUSE and HST/STIS datasets. The FUSE observations are part of the translucent cloud program (P116, Snow, 2000) and the STIS archival data was part of ``The snapshot survey of interstellar absorption lines'' (P8241, Lauroesch, 1999). The combined sets of data cover the wavelength range 912-1370 Å. The resolutions of 18 km/s (FUSE low-resolution aperture) and 2.75 km/s (STIS E140H) allow us to derive column densities for many important gas-phase species, among which are C I, C I*, C I**, O I, S I, Mg II, Mn II, Fe II and Cu II. Numerous H2 lines are present in the FUSE wavelength range permitting an accurate derivation of column densities by fitting rotational transitions from J=0 to 5 in well-selected Werner and Lyman bands. The physical properties of the gas in terms of pressure, temperature, electron and neutral hydrogen densities and abundances are derived and discussed. This work is supported by NASA contract NAS5-32985 . D. E. Welty acknowledges support from the NASA LSTA grant NAG5-3228 to the University of Chicago.

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