Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233l.147l&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 233, Nov. 1, 1979, p. L147-L150.
Astronomy and Astrophysics
Astronomy
45
Emission Spectra, Interstellar Gas, Molecular Spectra, Radio Sources (Astronomy), Abundance, Carbon Monoxide, Gas Density, Hydrocarbons
Scientific paper
Results are reported for observations of the 9-cm (3335.481-MHz) F = 1-1 spectrum of (C-12)H and the 2.6-mm (115,271.2-MHz) J = 1.0 spectrum of (C-12)O toward Zeta Oph. It is found that the strongest emission in either spectrum is located in a component at an LSR velocity of about -0.7 km/s, which corresponds to the neutral-bearing cloud of Hobbs (1973) at a heliocentric velocity of -14.4 km/s. The full width at half-maximum of this emission component is determined to be less than 0.5 km/s, which yields a thoroughly nominal b value of less than 0.3 km/s. The extent to which the presence of the narrow-lined cloud may have compromised the curve-of-growth analysis of elemental abundances is estimated, and the amount of carbon that may reasonably be expected to reside in this region is considered.
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