NASA NTRS · 19740032744
Interstellar oxygen-17
Abstract
Cases of line emission were observed from the molecular clouds associated with the Orion Nebula and the rho Ophiuchi complex. The emission is attributed to a certain rotational transition of CO consisting of the isotopes C-12 and O-17. This observation signifies the first detection of O-17 outside the solar system. It is pointed out that the relative abundance of O-17 is an important astrophysical quantity because of a possible enrichment during the hot CNO cycle.
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Encrenaz, P. J., Wannier, P. G., Jefferts, K. B., Penzias, A. A., Wilson, R. W.. 1973-12-01. Interstellar oxygen-17. https://ntrs.nasa.gov/citations/19740032744
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