Other
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..129c&link_type=abstract
Astrophysical Journal, Part 1, vol. 220, Feb. 15, 1978, p. 129-137.
Other
35
Absorption Spectra, Interstellar Gas, Stellar Models, Ultraviolet Spectra, Velocity Distribution, H Alpha Line, H Ii Regions, Radiative Transfer, Shock Wave Propagation, Ubv Spectra
Scientific paper
Scans of interstellar ultraviolet absorption lines of N I, N II, and Si III for 17 stars are combined with previously published data for 30 stars. The extremal velocities at which detectable absorption occurs are tabulated, and it is shown that these are correlated for the three species. The data suggest that intermediate-velocity gas (20 to 60 km/s), best known from Na I and Ca II absorption, contains both neutral and ionized hydrogen. Features characteristic of intermediate-velocity isothermal shocks (greater than 60 km/s) are conspicuously rare. The intermediate-velocity gas may be in the form of clouds containing both H I and H II regions or of radiative shocks propagating in the interstellar medium; in the latter case the gas should be detectable in H-alpha emission.
Cowie Lennox L.
York Don G.
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