Line lists for the A2PI-X2Sigma+ (red) and {B2Sigma+-X2Sigma} (violet) Systems of CN, 13C14N, and 12C15N, and Application to Astronomical Spectra

TL;DR

This paper presents new line lists for CN isotopologues in red and violet systems, applied to determine nitrogen abundances in the Sun and four red giant stars, improving the accuracy of stellar CNO measurements.

Contribution

The study provides newly generated CN isotopologue line lists and demonstrates their application to stellar abundance analysis, enhancing previous data accuracy.

Findings

Consistent nitrogen abundances from red and violet CN lines in stars.

New line lists improve CNO abundance determinations.

Results align with previously published values.

Abstract

New red and violet system line lists for the CN isotopologues 13C14N and 12C15N have been generated. These new transition data are combined with those previously derived for 12C14N, and applied to the determination of CNO abundances in the solar photosphere and in four red giant stars: Arcturus, the bright very low-metallicity star HD 122563, and carbon-enhanced metal-poor stars HD 196944 and HD 201626. When lines of both red and violet system lines are detectable in a star, their derived N abundances are in good agreement. The mean N abundances determined in this work generally are also in accord with published values.