A&A 452, 1049-1052 (2006)
DOI: 10.1051/0004-6361:20065009

High resolution optical spectroscopy of IRAS 09425-6040 (=GLMP 260)

D. A. García-Hernández¹, C. Abia², A. Manchado^{3, 4} and P. García-Lario<sup>1, 5

1</sup>  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 )

Abstract
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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