Physical Properties of H i and H II Regions

Details Physical Properties of H i and H II Regions Physical Properties of H i and H II Regions

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8484j&link_type=abstract

HST Proposal ID #8484

Computer Science

Hst Proposal Id #8484

Scientific paper

Interstellar absorption lines within the wavelength intervals 1170-1370A and 1630-1890A in the spectra of 10 early-type stars will be observed with the highest resolution mode of STIS, so that we can accomplish the following objectives: {1} measure the populations of the fine-structure levels of O I, C I and Si II within H I and H II regions, {2} determine the ionization ratios Al I/Al III {the Al II line will probably be too saturated}, S I/S II/S III, and Si I/Si II/Si III, and {4} measure the abundances of Mg, O, S, Ni and Si from unsaturated lines arising from their preferred ionization stages in H I regions. Objectives {1} and {2} should define local kinetic temperatures, densities of H atoms {both neutral and ionized}, and also the ratios of uv ionizing photons to electrons. Most of the target stars are in the CVZ.

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