Constraining Models of Galactic Chemical Evolution and Mixing by Measuring the Spatial Variability of D/H in the Interstellar Medium

Details Constraining Models of Galactic Chemical Evolution and Mixing by Measuring the Spatial Variability of D/H in the Interstellar Medium Constraining Models of Galactic Chemical Evolution and Mixing by Measuring the Spatial Variability of D/H in the Interstellar Medium

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10232f&link_type=abstract

HST Proposal ID #10232

Computer Science

Hst Proposal Id #10232 Ism

Scientific paper

Measuring the abundance of deuterium relative to hydrogen in the interstellar medium provides a method to assess the effects on the D/H ratio of astration and subsequent chemical enrichment of the ISM by supernovae, massive star winds, infalling gas, and mixing. It is now well established that D/H is approximately constant within the Local Bubble, at distances < 100 pc. At greater distances there is limited but growing evidence that it varies. However, confirmation of this, and a more definitive interpretation of the variability, requires improved measurements of the HI column density, which can only come from STIS measurements of the Ly alpha line. We request observations of 7 targets, all well outside the Local Bubble based on their DI column densities, to establish the degree of variability with high confidence. FUSE observations to determine N{DI} are complete for 5 targets, the remaining 30% of the data on a 6th target is scheduled to be obtained at the end of January, 2004, and the last target is part of an accepted FUSE cycle 5 program. With the improved HI column densities obtained with the observations proposed here, we will confirm the variability indicated by a small number of IMAPS and FUSE sight lines, and we will place important constraints on models of chemical evolution and mixing.

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