Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...197l..65c&link_type=abstract
Astrophysical Journal, vol. 197, Apr. 15, 1975, pt. 2, p. L65-L68.
Astronomy and Astrophysics
Astronomy
33
Abundance, Cosmic Dust, Interstellar Matter, Microwave Spectra, Nebulae, Radiative Recombination, Heavy Elements, Interstellar Magnetic Fields, Line Spectra, Molecular Spectra, Radio Astronomy, Zeeman Effect
Scientific paper
Observations of the 158-alpha recombination-line spectrum toward the dark cloud rho Oph show evidence for two features, which, if the cloud is quiescent as seems evident from molecular observations, are most reasonably attributed to carbon and probably sulfur. Given this interpretation, the apparent elemental depletion suggested by these microwave experiments agrees well with relative interstellar abundances derived from ultraviolet studies made with the Copernicus satellite, with Field's (1974) condensation-accretion theory of grain formation, and with the Carrasco, Strom, and Strom (1973) notion that grains grow in dense regions at the expense of heavy-element depletion. An attempted observation of Zeeman splitting of OH also suggests that if a uniform, longitudinal magnetic field exists, it must be less than about 0.5 milligauss over much of the central part of the rho Oph cloud.
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