Non-LTE Corrections for Sulfur Abundance in A-K Type Stellar Spectra
A grid of non-LTE (NLTE) abundance corrections for neutral-sulfur (S I) spectral lines in the visible and infrared, built from an updated sulfur atomic model with modern electron- and hydrogen-collision rates and extended to effective temperatures up to 10000 K by including ionized-sulfur levels. Enables unbiased sulfur-abundance determination in A- through K-type stars, validated on 13 stars, with refined oscillator strengths and a recommended S I line list.
2501.00774
Sulfur is an alpha-element whose abundance in stars traces galactic chemical evolution, but neutral-sulfur (S I) spectral lines form under conditions that depart from local thermodynamic equilibrium …