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. 2023 Dec 23;527(4):12120–12139. doi: 10.1093/mnras/stad3973

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© 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 6. — Comparison of the spectra of two RGB stars with similar stellar parameters, but very different abundances of carbon, nitrogen, and oxygen. The synthetic (observed) spectra of M4-47719 are shown in black (grey) and for M4-57318 in red (magenta). Features of , , and the CN molecule are indicated by vertical bars in each panel. The strong spurious feature at 7773 Å in M4-47719 was automatically flagged and ignored in the analysis of the spectrum.

Inline graphic — Comparison of the spectra of two RGB stars with similar stellar parameters, but very different abundances of carbon, nitrogen, and oxygen. The synthetic (observed) spectra of M4-47719 are shown in black (grey) and for M4-57318 in red (magenta). Features of , , and the CN molecule are indicated by vertical bars in each panel. The strong spurious feature at 7773 Å in M4-47719 was automatically flagged and ignored in the analysis of the spectrum.