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The Properties of the PDS Li-rich Giant Stars

Published online by Cambridge University Press:  25 May 2016

C. A. O. Torres ,
G. R. Quast ,
R. de la Reza  and
L. da Silva
C. A. O. Torres
Affiliation:
Laboratório Nacional de Astrofísica/MCT, CP 21, 37504-360 Itajubá, MG, Brazil
G. R. Quast
Affiliation:
Laboratório Nacional de Astrofísica/MCT, CP 21, 37504-360 Itajubá, MG, Brazil
R. de la Reza
Affiliation:
Observatório Nacional/MCT, Rua General José Cristino 77, 20921-030, Rio de Janeiro, Brazil
L. da Silva
Affiliation:
Observatório Nacional/MCT, Rua General José Cristino 77, 20921-030, Rio de Janeiro, Brazil

Abstract

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In the Pico dos Dias Survey (PDS), devised to search for young stellar objects, we found also K giants presenting moderate to strong Lithium lines associated with IRAS sources. But there are some gK with weak or absent Li lines too. There is a dichotomy in the distribution of the IRAS spectral indices between both kinds of K stars. A model of an expanding shell with a mass-dependent velocity may explain this behavior, if the photospheric Li depletion takes only ˜2500 yrs.

Type
4. Lithium Abundances
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 320 - 324
Copyright
Copyright © Astronomical Society of the Pacific 2000 

References

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