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Discovery of anomalous oxygen isotopic ratios in HR 4049

Authors
Type
Published Article
Journal
ScienceOpen Astronomy & Astrophysics
Publisher
ScienceOpen
Publication Date
Feb 01, 2001
Volume
367
Issue
2
Pages
1–4
Source
SETI Institute
License
Unknown

Abstract

We report the discovery in the ISO/SWS spectrum of the post-AGB star HR 4049 of emission bands due to 17 O and 18 O isotopes locked up in CO 2 molecules. It is the first time these isotopomers are detected outside the solar system. Isotopic ratios derived in the optically thin limit are as low as 16 O/17 O $= 8.3\ pm 2.3$ and 16 O/$^18\ rm O= 6.9\ pm 0.9$. These values are at least one order of magnitude lower than any previously determined isotopic ratio in any type of evolved star.

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