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Peculiar J-type Carbon Stars and Li

Published online by Cambridge University Press:  25 May 2016

S. Lorenz-Martins  and
N. A. Drake
S. Lorenz-Martins
Affiliation:
Observatório do Valongo/UFRJ, Ladeira Pedro Antonio, 43, Rio de Janeiro, 20080-090 Brazil
N. A. Drake
Affiliation:
Observatório Nacional/MCT, R. José Cristino, 77, Rio de Janeiro, 20921-400 Brazil Astronomical Institute of St. Petersburg State University, St. Petersburg, 198904 Russia

Extract

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We determined the carbon and lithium abundances and carbon isotopic ratios for 4 peculiar carbon stars by means of spectral synthesis method. Li abundances were derived using Li resonance line at λ6707.8 Â. For carbon abundance determinations we used the lines of the red system of CN molecule. Spectral region of λλ7994 — 8030 Â containing the lines of molecules 12CN and 13CN was used also for 12C/13C ratio measuring. The high-resolution spectra were obtained on the 1.52m telescope of ESO with the Fiber-fed Extended Range Optical Spectrograph (FEROS). These observations were obtained under the agreement between the CNPq-Observatório Nacional, Brazil, and ESO.

Type
6. Stellar Knowledge to and from Light Elements
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 506 - 507
Copyright
Copyright © Astronomical Society of the Pacific 2000 

References

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