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Lithium-Rich K Giants with Infrared Excesses: Fundamental Parameters and CNO Abundances

Published online by Cambridge University Press:  25 May 2016

Natalia A. Drake ,
Ramiro de la Reza  and
Licio da Silva
Natalia A. Drake
Affiliation:
1Observatório Nacional/MCT, R. José Cristino, 77 CEP: 20921-400, Rio de Janeiro, Brazil 2Astronomical Institute of St. Petersburg University, St. Petersburg, 198904 Russia
Ramiro de la Reza
Affiliation:
1Observatório Nacional/MCT, R. José Cristino, 77 CEP: 20921-400, Rio de Janeiro, Brazil
Licio da Silva
Affiliation:
1Observatório Nacional/MCT, R. José Cristino, 77 CEP: 20921-400, Rio de Janeiro, Brazil

Extract

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We present the results of an analysis of seven faint K giants with strong Li lines, recently discovered during the Picodos Dias urvey, from high-resolution and high signal-to-noise-ratio spectra. The fundamental parameters of these stars, such as effective temperature, surface gravity, metallicity and microturbulence, were determined. We also obtained LTE abundances of Li and CNO elements and measured the 12C/13C ratios by spectral synthesis using the lines of Li I (λ6104Â and λ6708 Â), C2, CN, and [O I]. The studied Li K stars are found to be red giant branch stars with masses around 1M⊙.

Type
6. Stellar Knowledge to and from Light Elements
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 502 - 503
Copyright
Copyright © Astronomical Society of the Pacific 2000 

References

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