Carbon and nitrogen abundances in Population I G and K giant stars from DDO photometry
Open Access
- 1 November 1982
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 201 (2) , 253-263
- https://doi.org/10.1093/mnras/201.2.253
Abstract
It is shown that synthetic DDO photometric indices can be used with precise DDO photometric observations of Population I G and K giants to determine carbon and nitrogen abundances and temperatures for these stars. Results for 16 stars are given. They are compared with theoretical calculations of C/N ratios in giant stars after convective mixing of CN cycle processed material with the stellar atmosphere. Good agreement is found. The predicted stellar mass dependence of the C/N ratio is also observed. The results are in good agreement with the results of spectroscopic analyses of CN abundances by Lambert & Ries for the six stars in common.Keywords
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