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Li Enrichment, Mass Loss, and CN Abundances in High Rotating K Giants

Published online by Cambridge University Press:  26 May 2016

N. A. Drake ,
R. de la Reza ,
L. da Silva  and
D. L. Lambert
N. A. Drake
Affiliation:
Observatório Nacional/MCT, Rua General José Cristino 77, 20921-400, Rio de Janeiro, Brazil
R. de la Reza
Affiliation:
Observatório Nacional/MCT, Rua General José Cristino 77, 20921-400, Rio de Janeiro, Brazil
L. da Silva
Affiliation:
Observatório Nacional/MCT, Rua General José Cristino 77, 20921-400, Rio de Janeiro, Brazil
D. L. Lambert
Affiliation:
Department of Astronomy, University of Texas at Austin, Austin, TX 78712 USA

Abstract

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High rotating low-mass K giants can be considered as interesting new “laboratories” for studies of the mixing process and mass loss. By means of high spectral resolution observations of some rapidly rotating K giants we found a series of connections between rotation, stellar activity, high Li abundance and mass loss. These giants show low 14N and high 13C enrichment. Nearly half of them are Li rich. This frequency is much higher than the ~ 2% corresponding to common, low rotating K giants. They are also the most suitable objects to test new models of rotation-induced mixing or planet engulfing scenarios.

Type
Session 2 Rotation in Relation with Abundances and Magnetic Fields
Information
Symposium - International Astronomical Union , Volume 215: Stellar Rotation , 2004 , pp. 242 - 243
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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