Abundance Enhancements in Halo Gas

Computer Science

Scientific paper

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Hst Proposal Id #2348

Scientific paper

We propose to use HRS in its moderate resolution mode to examine interstellar absorption lines in the spectra of stars situated ~1 kpc or more from the galactic plane. We will compare Fe II, S II, Si II and Al II to see if their relative abundances differ from ordinary interstellar gas, as indicated by a conservative interpretation of some IUE data. We will equate possible abundance enhancements in halo gas, if they are indeed real, with element replenishments found in shocked gases in the plane (associated with the Vela SNR) to see if the pattern from element to element differs from that resulting from the destruction of grains. This differentiation will indicate whether the principal enhancements are from grain evaporation as the gas is ejected from the plane, or whether element injection from Type I supernovae plays an important role.

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