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Mass loss and luminosities of S and C AGB stars with and without Li

Published online by Cambridge University Press:  23 April 2010

Roald Guandalini ,
Sara Palmerini ,
Maurizio Busso ,
Enrico Maiorca  and
Stefan Uttenthaler
Roald Guandalini
Affiliation:
Dipartimento di Fisica, Universitá degli Studi di Perugia, via Pascoli, 06123, Perugia, Italy email: guandalini@fisica.unipg.it
Sara Palmerini
Affiliation:
Dipartimento di Fisica, Universitá degli Studi di Perugia, via Pascoli, 06123, Perugia, Italy email: guandalini@fisica.unipg.it I.N.F.N. sezione di Perugia
Maurizio Busso
Affiliation:
Dipartimento di Fisica, Universitá degli Studi di Perugia, via Pascoli, 06123, Perugia, Italy email: guandalini@fisica.unipg.it I.N.F.N. sezione di Perugia
Enrico Maiorca
Affiliation:
Dipartimento di Fisica, Universitá degli Studi di Perugia, via Pascoli, 06123, Perugia, Italy email: guandalini@fisica.unipg.it I.N.F.N. sezione di Perugia
Stefan Uttenthaler
Affiliation:
Instituut voor Sterrenkunde, K. U. Leuven, Celestijnenlaan 200D, 3000 Leuven, Belgium
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Abstract

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We present the preliminary results of an analysis performed on two samples of thermally pulsing Asymptotic Giant Branch stars from our Galaxy, the first made of carbon-rich sources and the second of S-type stars. We have estimated their absolute luminosities and updated rates of the stellar winds through methods based on their infrared spectrophotometry and on updated estimates of their variability and distance.

We then focus on those sources in our database showing Li in their spectra looking for correlations between the Li abundance and the other physical parameters, in the aim of establishing observational criteria for understanding the conditions for the occurrence of the deep mixing phenomena to which the production of Li is currently attributed.

Keywords

Stars: evolutionAGBpost-AGB – infrared: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 311 - 316
Copyright
Copyright © International Astronomical Union 2010

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