Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228..127y&link_type=abstract
Astrophysical Journal, Part 1, vol. 228, Feb. 15, 1979, p. 127-146.
Astronomy and Astrophysics
Astrophysics
136
Abundance, Hydrogen Clouds, Interstellar Gas, Interstellar Radiation, Line Spectra, Ultraviolet Spectra, Astronomical Spectroscopy, Doppler Effect, Fine Structure, Gas Density, Hydrogen Atoms, Solar System, Spectral Line Width
Scientific paper
Measurements of the UV interstellar lines in Alpha Vir between 935 and 2960 A are reported. The derived abundances indicate significant depletion of Al, Si, Mn, Fe, and possibly Mg, whereas S, C, Ar, and O appear to be essentially undepleted. About half the gas is shown to be ionized, with a mean electron density of no more than 1 per cu cm, and the remainder is neutral, though both regions have the same velocity to within 2 km/s. A small fraction of the gas is apparently at a temperature of 400,000 K. The possibility of measuring the temperature of the H I gas is discussed, using the observed relationship between Doppler width and mass. A detailed discussion is included of the data analysis useful for comparatively simple lines of sight in terms of density, temperature, and extent of the possible physical regions, and of the relevant radiation field. An unidentified feature at 1063.2 A is reported.
Kinahan Blake F.
York Don G.
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