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Astron. Astrophys. 340, 160-162 (1998)


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Research Note

On the convective envelope of AGB stars

V. Castellani 1, 2, M. Marconi 1, 3 and O. Straniero 4

1 Dipartimento di Fisica, Universitá di Pisa, I-56126 Pisa, Italy
2 Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56100, Italy
3 Osservatorio Astronomico di Capodimonte, I-80131 Napoli, Italy
4 Osservatorio Astronomico di Teramo, I-64100 Teramo, Italy

Received 26 February 1998 / Accepted 28 July 1998

Abstract

We discuss evolutionary computations investigating the efficiency of the convective "drift" which should affect the location of the inner boundary of the convective envelope in cool giant stars. We find that the drift is at the work in structures undergoing the second dredge up, accelerating the sinking of the envelope into the inner He rich layers and producing smaller C-O cores at the onset of thermal pulses or at the C-ignition. However, such differences appear rather small, with mild consequences on the overall evolutionary scenario.

Key words: convection – stars: evolution – stars: interiors – stars: AGB and post-AGB

Send offprint requests to: M. Marconi, Dipartimento di Fisica Università di Pisa, Piazza Torricelli 2, I-56126 Pisa, Italy (marcella@astr18pi.difi.unipi.it)

© European Southern Observatory (ESO) 1998

Online publication: November 3, 1998

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