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Lithium Abundances in Solar-Type Stars1

Published online by Cambridge University Press:  25 May 2016

L. da Silva  and
G. F. Porto de Mello
L. da Silva
Affiliation:
CNPq/Observatório National, Brazil
G. F. Porto de Mello
Affiliation:
Observatório do Valongo, Universidade Federal do Rio de Janeiro, Brazil

Extract

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We report Li abundances from the λ6707 line for 19 nearby dwarf and subgiant solar-type stars. The unevolved stars in this sample present high (> 2.00) Li abundances. We found a few cases of subgiant stars which present high Li content. The Sun seems to be part of a population of nearly unevolved stars which have depleted their Li to a high degree: all other metal-normal, near ZAMS stars in our sample show higher than solar Li content. There seems to be no correlation of the degree of Li depletion with mass, atmospheric parameters or state of evolution: as an example we found a star (HR1532) almost identical to the Sun in its state of evolution and atmospheric parameters, but with over ten times the solar Li abundance. We propose that different histories of angular momentum distribution at star birth, and/or post-birth angular momentum evolution, may account for these differences.

Type
6. Stellar Knowledge to and from Light Elements
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 495 - 497
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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