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April 1, 2026

3D NLTE sodium abundances in late-type stars. Abundance corrections and synthetic spectra

G. Canocchi E. X. Wang A. M. Amarsi K. Lind M. Racca

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Key Points

This research investigates the errors in sodium abundance analysis caused by different modeling approaches in stellar atmospheres.
Studied nine sodium lines in FGK dwarf and giant stars.
Utilized 3D NLTE radiative transfer post-processing with a grid of 3D radiation hydrodynamic models.
Compared results with 1D LTE and 1D NLTE corrections for sodium abundances.
3D NLTE abundance corrections relative to 1D LTE are typically negative for weak lines.
Corrections for saturated lines in low-gravity giants can reach as low as -0.7 dex.
Positive corrections around +0.05 dex are found for D resonance lines at the lowest metallicities.

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Implication

This work analyzes sodium abundance corrections in stellar spectra, highlighting implications for exoplanet atmospheres.

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Cite This Study

Canocchi et al. (2026) studied this question.

synapsesocial.com/papers/69d5f09e74eaea4b11a79f93 https://doi.org/10.1051/0004-6361/202558382/pdf

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