Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290..251c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 1, 1985, p. 251-255.
Astronomy and Astrophysics
Astrophysics
31
Abundance, Interstellar Gas, Molecular Clouds, Molecular Spectra, O Stars, Stellar Spectrophotometry, B Stars, Carbon, Carbon Dioxide, Electron Density (Concentration), Hydrocarbons, Optical Emission Spectroscopy, Radio Spectra
Scientific paper
Observations of optical interstellar lines at blue wavelengths have been made of the very heavily reddened star HD 147889, which is behind the outer envelope of the Rho Ophiuchi molecular cloud. The lines 3875 of CN, 3933 of Ca II, 4232 of CH(+), 4300 of CH, and possibly 4226 of Ca I have been detected and measured. Using these and additional published data, the abundances and physical conditions of the Rho Oph cloud toward HD 147889 have been analyzed. CO, C2, and CH all appear to have relative abundances which are insensitive to physical conditions. The depletion of calcium is larger than typical for diffuse clouds but may not be larger than toward considerably less reddened stars in Ophiuchus. The electron density is about 0.5/cu cm, which implies an H2 density of 1000/cu cm or greater. CN is found to be two orders of magnitude lower in relative abundance in the Ophiuchus cloud in comparison with the Taurus cloud.
Chu Y.-H. Y.-H.
Crutcher Richard M.
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