Determining D/H Ratios and Physical Conditions in Local Interstellar Gas Using White Dwarf Probes

Details Determining D/H Ratios and Physical Conditions in Local Interstellar Gas Using White Dwarf Probes Determining D/H Ratios and Physical Conditions in Local Interstellar Gas Using White Dwarf Probes

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9217s&link_type=abstract

HST Proposal ID #9217

Physics

Hst Proposal Id #9217 Ism And Circumstellar Matter

Scientific paper

Using archival GHRS and STIS spectra toward 21 white dwarfs {WDs} located within 200 pc, we propose to determine the D/H abundance ratios and physical conditions in the intervening diffuse Local Interstellar Medium {LISM} clouds. Our study will result in emph7 new D/H ratio measurements {toward GD659, REJ0503-289, EUVEJ1126+18.6, V471 Tau, Feige 24, 2REJ1032+532 and 2REJ2156-543}, which represents a 41 in the number of known D/H measurements in the LISM. Our results will be used to extend the 3D model of local clouds constructed by Linsky & collaborators. N/H measurements in the LISM are possible only by using WD spectra {as opposed to late-type star spectra}. We will derive N/H ratios for these WD sightlines and compare them with the diffuse ISM value. We will test a recently reported claim on the anticorrelation of the D/H and N/H ratios in more distant diffuse ISM clouds and explore its possible causes and its implications for the LISM. We will obtain emph2 new electron density measurements in the LISM and combine them with published measurements to test predictions of the models constructed by Bruhweiler & collaborators which suggest that the electron density should vary in the Local Interstellar Cloud {LIC} and that it should increase near its interface with the surrounding 10^6 gas.

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