AAS 197, January 2001
Session 7. Gas in the Galactic ISM
Display, Monday, January 8, 2001, 9:30am-7:00pm, Exhibit Hall

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[7.04] A Study of Abundances above the Perseus Arm: the HD218915 sightline

D. Fabian, B.D. Savage (Univ. of Wisconsin - Madison), K.R. Sembach (The Johns Hopkins University)

We present absorption line data for the sightline toward HD218915, an O9.5Iab star at l=108\arcdeg, b=-6.89\arcdeg, & d=2.1 kpc that probes material approximately 300 pc away from the mid-plane of the Perseus spiral arm. The E140H STIS data (at 3.5 km s-1 resolution) shows distinct absorption due to \ion{S}{3}, \ion{Cl}{1}, \ion{P}{2}, \ion{Mg}{2}, \ion{Mn}{2}, \ion{Ga}{2}, \ion{Ge}{2}, \ion{Cu}{2}, & \ion{Ni}{2} at -50 km s-1 resulting from Perseus Arm gas. Data from FUSE add information about \ion{Fe}{2}, \ion{Si}{2}, & \ion{Ar}{1}, allowing us to determine gas and dust phase abundances for wide range of depleted species. Also present along this sightline are two low column density intermediate velocity components at -70 and +42 km s-1, seen in the strongest metal lines. We look for evidence of grain processing by energetic events in the Perseus arm and compare the results with previous determinations of warm and halo cloud depletion patterns.

This work is based on data obtained for the Guaranteed Time Team by the NASA-CNES-CSA FUSE mission operated by the Johns Hopkins University. Financial support has been provided by NASA contract NAS5-32985 and STScI Grant GO 07270.02.

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