Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6638g&link_type=abstract
HST Proposal ID #6638
Physics
Hst Proposal Id #6638 Interstellar Medium
Scientific paper
We propose to study the physical conditions in diffuse clouds in the Local Bubble environment and their interfaces with the hot gas filling the bubble. , The local interstellar medium presents a favourable situation to check the general ISM theories. Particularly helpfull are lines of sight with low column densities and few or well separated velocity components, which are resolved at a resolution of 10^5., These include nearby white dwarfs which will be better observed in cycle 7 with STIS, and a few early-type stars in the particularly empty direction of Canis Majoris, which present the advantage of a long pathlength through the hot bubble gas. These stars will on the contrary be observed much more efficiently with GHRS, for which cycle 6 presents the last opportunity., The main questions that high resolution UV spectroscopy will allow to address are :, - the characterisation of the interface between diffuse clouds and the hot bubble gas., - the ionization state and the depletion level in the local environment., - the nature of the various different velocity components found in a small volume around the sun.,
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