Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9876w&link_type=abstract
HST Proposal ID #9876
Physics
Hst Proposal Id #9876 Ism And Circumstellar Matter
Scientific paper
We wish to sample the absorption characteristics of 3 lines-of-sight in the local interstellar medium to establish the physical location of the production sites of the highly ionized absorption lines of CIV, SiIV and NV. Such lines are formed at gas temperatures of 100, 000K and all have been widely observed throughout the Galaxy. However, evidence for the formation of any of these high ions within the hot gas of the Local Bubble {LB} remains inconclusive, supporting the similar lack of detections of the OVI ion {T 300, 000K} within 100pc recently reported by the FUSE satellite. Using our recently gained information on the contours of the neutral boundary to the LB, we have selected 3 pairs of stars located just within, and just beyond the LB boundary. We shall test whether high ionization ions are formed either {a} beyond the LB boundary in more distant interstellar bubbles of hot gas, {b} at the conductive interface of the LB neutral boundary, or {c} at possible conductive interfaces between hot gas within the LB and the diffuse clouds embedded within it. Hoepfully, these observations will enable theorists to better model the {anomalous} ionization state, pressure and chemical abundance of the local interstellar gas and will assist in the interpretation of data soon to be gained from the NASA CHIPS mission.
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