Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..242l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 1, p. 242-246.
Astronomy and Astrophysics
Astrophysics
8
Carbon Monoxide, Carbon 13, Gas Density, Gas Temperature, Molecular Gases, Ophiuchi Clouds, Abundance, Interstellar Gas, Interstellar Matter, Line Of Sight
Scientific paper
The J = 2-1 lines of (C-12)O and (C-13)O have been observed around Zeta Oph at positions corresponding to the earlier J = 1-0 data of Liszt (1992), in order to determine the number density, temperature, and isotopic abundance ratio. The observations are consistent with a range of physical conditions. For temperatures of 20-40 K, the H2 number density is only 50 percent higher at the J = 1-0 emission peak than toward the star, the column density is larger by a factor of a few, and the (C-12)O/(C-13)O column density ratio is 60. For Tk not greater than 10 K, both the CO column density and H2 number density would be larger by factors of 5-20 (compared to the line of sight toward Zeta Oph), and the isotope ratio in CO would be greater than 89.
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