Other
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3746g&link_type=abstract
HST Proposal ID #3746
Other
Hst Proposal Id #3746
Scientific paper
We want to study the cooling processes of the local interstellar medium by observing the population of the excited fine-structure states in the ground electronic level of ionized carbon and neutral atomic oxygen. Far-IR line emission between these excited states and the ground states of these ions is the main cooling agent of the cold and warm neutral atomic gas respectively. The corresponding column densities in front of bright stars will be obtained from GHRS observations of electronic transitions originating from these states. In order to study the structure of the interstellar matter along the lines of sight, other transitions will be observed with the GHRS and from the ground: this is necessary to correctly derive the column densities of the different individual components by fitting the lines with theoretical profiles and to separate the neutral from the ionized medium along the lines of sight. A comparison of the results with direct observations of the FIR fine-structure lines from COBE and later from ISO and SIRTF will allow to determine to what extent the local interstellar medium is representative of the general medium at galactic scales, and in particular to compare the far-UV interstellar radiation fields.
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