Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...128..355b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 128, no. 2, Dec. 1983, p. 355-361.
Astronomy and Astrophysics
Astrophysics
12
Astronomical Spectroscopy, Interstellar Gas, Molecular Clouds, Molecular Rotation, Oxygen Isotopes, Abundance, Hydroxyl Radicals, Line Spectra, Molecular Energy Levels
Scientific paper
The authors report the observation of 18OH absorption in a cold cloud located near the galactic center, and in another one close to the sun. The 16OH/18OH ratio in these sources is found higher than the ratios previously derived in hot sources and equal, within the rather large errors, to the terrestrial 16O/18O ratio. Due to their low abundance, 18OH and 17OH are unlikely to be anomalously excited, and their 18-cm opacity ratio is expected to be equal to their column density ratio. The authors' observations of 18OH and 17OH in Sgr B2 yield an abundance ratio of 3.6±0.5, similar to the C18O/C17O and HC18O+/HC17O+ ratios and 1.5 times smaller than the terrestrial 18O/17O abundance ratio.
Bujarrabal Valentin
Cernicharo Jose
Guélin Michel
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