Volume 452, Number 3, June IV 2006
|Page(s)||1049 - 1052|
|Published online||06 June 2006|
High resolution optical spectroscopy of IRAS 09425-6040 (=GLMP 260)
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
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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