High resolution optical spectroscopy of IRAS 09425-6040 (=GLMP 260)
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 (log (Li/H) + 12 ~ 0.7) with a low 12C/13C = 15+-6 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 (M > 3 M_sun) 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.
Cite
@article{arxiv.astro-ph/0603264,
title = {High resolution optical spectroscopy of IRAS 09425-6040 (=GLMP 260)},
author = {D. A. Garcia-Hernandez and C. Abia and A. Manchado and P. Garcia-Lario},
journal= {arXiv preprint arXiv:astro-ph/0603264},
year = {2009}
}
Comments
5 pages, 2 figures, accepted for publication in A&A