Discovery of anomalous oxygen isotopic ratios in HR 4049

Authors
Cami, J Yamamura, I
Citation
J. Cami et I. Yamamura, Discovery of anomalous oxygen isotopic ratios in HR 4049, ASTRON ASTR, 367(2), 2001, pp. L1-L4
Citations number
20
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
00046361 → ACNP
Volume
367
Issue
2
Year of publication
2001
Pages
L1 - L4
Database
ISI
SICI code
0004-6361(200102)367:2<L1:DOAOIR>2.0.ZU;2-X
Abstract
We report the discovery in the ISO/SWS spectrum of the post-AGE star HR 404 9 of emission bands due to O-17 and O-18 isotopes locked up in CO2 molecule s. It is the first time these isotopomers are detected outside the solar sy stem. Isotopic ratios derived in the optically thin limit are as low as O-1 6/O-17 = 8.3 +/- 2.3 and O-16/O-18 = 6.9 +/- 0.9. These values are at least one order of magnitude lower than ally previously determined isotopic rati o in any type of evolved star.