HST, Chandra, and FUSE Studies of Interstellar Material toward HD 24534 {aka X Persei}

Details HST, Chandra, and FUSE Studies of Interstellar Material toward HD 24534 {aka X Persei} HST, Chandra, and FUSE Studies of Interstellar Material toward HD 24534 {aka X Persei}

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8623s&link_type=abstract

HST Proposal ID #8623

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Hst Proposal Id #8623 Ism And Circumstellar Matter

Scientific paper

We are proposing new HST/STIS high-resolution UV spectroscopic observations of the reddened star HD 24534 {aka X Persei}, in order to: {1} establish accurate gas-phase column densities for elements other than carbon and oxygen {for which high- quality data already exist}, for the purpose of deriving {in conjunction with FUSE and Chandra observations} absolute depletions of several key elements; and {2} further pursue molecular abundances toward this star, to supplement HST/GHRS data obtained earlier which showed that this line of sight supports a rich chemistry. The depletion work will focus on magnesium, silicon, and iron, while the molecular observations will entail searches for vibrationally excited H_2, an important indicator of cloud physical conditions; and sulfur- bearing species {such as SO, CS, and SH}, which represent an important unknown in current models of interstellar cloud chemistry. HD 24534 is the best possible target for this work, because it is the brightest star available that lies behind a translucent line of sight with high molecular abundances, and because it is also an x-ray source whose spectrum is ideally suited for the measurement {through x-ray absorption and scattering} of total {gas plus dust} abundances in the line of sight. This will be the first line of sight for which depletions have been determined independent of any assumed ``cosmic'' abundance standard such as the sun or other stars.

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