Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9855c&link_type=abstract
HST Proposal ID #9855
Physics
Hst Proposal Id #9855 Ism And Circumstellar Matter
Scientific paper
We propose to obtain high-resolution STIS echelle observations of the interstellar Kr I 1236 absorption toward eight stars situated in the Galactic disk beyond the Carina/Sagittarius or Perseus Arms. The measurement of interstellar krypton abundances is a relatively simple way to investigate elemental abundance variations in the Galaxy, since its dominant form is neutral and it is undepleted in the ISM. Furthermore, the intrinsic strengths of krypton's UV resonance lines combined with its low relative abundance to hydrogen produce weak, unsaturated features in typical Galactic sight lines. Previous GHRS and STIS measurements have demonstrated that Kr/H abundance ratios within the local spiral arm, the Orion Spur, are remarkably uniform; however, anomalously high krypton abundances have been measured for the only two sight lines extending also through gas outside the Orion Spur. This program is designed to determine whether these sight lines are isolated cases of enrichment, or if they are representative of large scale krypton abundance variations outside the local arm. Since krypton is undepleted in the ISM, these observations will also be relevant to the study of total elemental abundance and depletion variations for a variety of elements with resonance lines between 1170 and 1372 Angstroms.
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