Issue |
A&A
Volume 452, Number 3, June IV 2006
|
|
---|---|---|
Page(s) | 1049 - 1052 | |
Section | Stellar atmospheres | |
DOI | https://doi.org/10.1051/0004-6361:20065009 | |
Published online | 06 June 2006 |
High resolution optical spectroscopy of IRAS 09425-6040 (=GLMP 260)
1
ISO Data Centre, European Space Astronomy Centre (ESAC), ESA. Villafranca del Castillo. PO Box - Apdo. 50727, 28080 Madrid, Spain e-mail: Anibal.Garcia@sciops.esa.int
2
Departamento de Física Teórica y del Cosmos, Universidad de Granada, 18071 Granada, Spain
3
Instituto de Astrofísica de Canarias, 38200 La Laguna, Spain
4
Consejo Superior de Investigaciones Científicas, Spain
5
Herschel Science Centre, Research and Scientific Support Department of ESA, European Space Astronomy Centre (ESAC), Villafranca del Castillo, PO Box- Apdo. 50727, 28080 Madrid, Spain
Received:
11
February
2006
Accepted:
9
March
2006
We present high resolution optical spectroscopic observations of IRAS
09425-6040, a peculiar, extremely red, C-rich AGB star showing prominent
O-rich dust features in its ISO infrared spectrum attributed to crystalline
silicates. Our analysis shows that IRAS 09425-6040 is indeed a C-rich star
slightly enriched in lithium () with a low
12C/13C =
ratio. We also found some evidence that it may be
enriched in s-elements. Combining our results with other observational data
taken from the literature we conclude that the star is possibly an
intermediate-mass TP-AGB star (
) close to the end of
its AGB evolution which may have only very recently experienced a radical
change in its chemistry, turning into a carbon-rich AGB star.
Key words: stars: AGB and post-AGB / stars: individual: IRAS 09425-6040 / stars: abundances
© ESO, 2006
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