Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sf2a.conf..237m&link_type=abstract
SF2A-2010: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics. Eds.: S. Boissier, M. Heydari-
Astronomy and Astrophysics
Astrophysics
Agb Stars, Mass-Loss, Circumstellar Matter
Scientific paper
We report the detection of several metals in atomic form in the gas phase of the envelope of IRC+10216, the archetype of evolved carbon-rich AGB stars.By observing with VLT-UVES a background star located behind the envelope at 35 arcsec from center, optical absorption lines of Na, K, Ca, Fe and Cr are revealed. It is the first time that circumstellar Fe is detected in a dusty envelope. The column densities of the circumstellar metals are derived. Then, the abundances of these metalsare obtained with a model treating the photoionization of these elements in the outer envelope. The fraction of these metals present in the gas phase can be obtained, and a strong depletion of Fe and Ca onto grains is derived. The atomic abundances can alsobe compared to the abundance of metals carried by molecules. Our observations suggest that in the gas phase, the metals are much more abundant in atomic form than in molecular form. Our results are also consistent with metal depletions in planetary nebulae.
Huggins Patrick J.
Mauron Nicolas
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