| Issue |
A&A
Volume 367, Number 2, February IV 2001
|
|
|---|---|---|
| Page(s) | L1 - L4 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20000560 | |
| Published online | 15 February 2001 | |
Discovery of anomalous oxygen isotopic ratios in HR 4049 *
1
Astronomical Institute "Anton Pannekoek", University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
2
SRON-Groningen, PO Box 800, 9700 AV Groningen, The Netherlands
3
The Institute of Space and Astronautical Science (ISAS), Yoshino-dai 3-1-1, Sagamihara, Kanagawa 229-8510, Japan e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Corresponding author: J. Cami, This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
30
November
2000
Accepted:
22
December
2000
Abstract
We report the discovery in the ISO/SWS spectrum of the
post-AGB star HR 4049 of emission bands due to 17O and
18O isotopes locked up in CO2 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
16O/17O 
and 16O/
. These values are at least one order of magnitude lower than any
previously determined isotopic ratio in any type of evolved star.
Key words: stars: AGB and post-AGB / stars: circumstellar matter / stars: individual: HR 4049 / stars: abundances / stars: late-type / infrared: stars
Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the UK) with the participation of ISAS and NASA. The SWS is a joint project of SRON and MPE.
© ESO, 2001
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