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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
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

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
Copyright
Copyright © Astronomical Society of the Pacific 2000 

References

Bell, R.A., Eriksson, K., Gustafsson, B., & Nordlund, Å. 1976, A&AS, 23, 37 Google Scholar
de la Reza, R., Drake, N.A., da Silva, L. 1996, ApJ, 456, L115 CrossRefGoogle Scholar
de la Reza, R., Drake, N.A., da Silva, L., Torres, C.A.O., & Martin, E.L. 1997, ApJ, 482, L77 CrossRefGoogle Scholar
Drake, N.A. 1998, , Google Scholar
Kurucz, R.L. 1993, ATLAS9, Smithsonian Astroph. Obs. CD-ROM no. 13 Google Scholar
Sackmann, I.-J., & Boothroyd, A.I. 1999, ApJ, 510, 217 CrossRefGoogle Scholar
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