Absorption Line Studies of the High Velocity Cloud M II - Cycle 3 Supplemental

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Hst Proposal Id #4392

Scientific paper

The extremely fortuitous alignment of HD 93521 and BD +38 2182 (~25 arcmin separation, z=1.5, 4.1 respectively) provides a rare opportunity to study the distribution and physical nature of gas in the milky way halo. Recent results from our IUE observations show that (1) the HVC M II is detected in absorption toward the more distant star, BD +38 2182, and (2) some evidence is found for spatial variations on scales less than 12 pc. Both of these observations have great implications for models of halo gas production. We wish to observe six setting on BD +38 2182 which, when added to the three other setting on this star that will be taken as part of our Cycle 2 program, make up a complete, complementary set of data by which to confirm and extend our studies.

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