The Abundance Ratio 16OH/18OH in Sagittarius-A and SAGITTARIUS-B2

Details The Abundance Ratio 16OH/18OH in Sagittarius-A and SAGITTARIUS-B2 The Abundance Ratio 16OH/18OH in Sagittarius-A and SAGITTARIUS-B2

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197p..39w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 197, P. 39P, 1981

Astronomy and Astrophysics

Astronomy

10

Scientific paper

Using the satellite-line transitions of the 2π3/2J = 3/2 ground state of OH, isotope abundance ratios [16OH] /[18OH] of 277 ± 20 and 261 ± 20 have been obtained for the +40 km 1 molecular cloud near Sgr A and the + 60 km s-1 cloud in Sgr B2. The results are further evidence that the ratios near the Galactic Centre are lower than the terrestrial ratio [16O]/[18O] of 489. For the +40 km s-1 cloud the satellite-line anomalies of the 16OH and 18OH transitions are similar. However, with the +60 km s-1 cloud the difference between the satellite lines is less marked for the 18OH than for the 16OH transitions.

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