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Quantitative Analysis of Carbon Isotope Ratios in N-, SC-, and J-type Carbon Stars

Published online by Cambridge University Press:  25 May 2016

K. Ohnaka  and
T. Tsuji
K. Ohnaka*
Affiliation:
Institute of Astronomy, The University of Tokyo, Mitaka, Tokyo, 181 Japan
T. Tsuji
Affiliation:
Institute of Astronomy, The University of Tokyo, Mitaka, Tokyo, 181 Japan
*
* Now at Technische Universität Berlin, Germany

Abstract

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We present the results of a quantitative analysis of 12C/13C ratios in 62 N-type, 15 SC-type, and 26 J-type carbon stars. The 12C/13C ratios are determined from lines of the CN Red System around 8000 Å, based on the iso-intensity method and line-blanketed model atmospheres. The resulting 12C/13C ratios in N- and SC-type carbon stars are consistent with a scenario in which M giants evolve through SC- to N-type carbon stars, as 12C produced during thermal pulses is added to the envelope.

Type
Session II — Models and Abundance Determinations
Information
Symposium - International Astronomical Union , Volume 177: The Carbon Star Phenomenon , 2000 , pp. 81 - 87
Copyright
Copyright © Kluwer 2000 

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