NLTE effects on oxygen lines
Astrophysics
2009-10-31 v1
Abstract
The NLTE effects affecting oxygen-abundance determinations of solar-type stars are discussed. LTE is perfectly safe for the forbidden lines. The permitted triplet at 777 nm is expected to show NLTE effects on the order of a few tenths of a dex (always in the sense that LTE overestimates the abundance), but the magnitude of the effects is dependent on the still very uncertain cross sections of collisional excitation by collisions with neutral hydrogen atoms. Little is known about the NLTE effects on molecular line formation.
Keywords
Cite
@article{arxiv.astro-ph/0010300,
title = {NLTE effects on oxygen lines},
author = {Dan Kiselman},
journal= {arXiv preprint arXiv:astro-ph/0010300},
year = {2009}
}
Comments
8 pages, 2 figures, to be published in New Astronomy Reviews as proceedings of JD8 of IAU GA 2000, eds. B. Barbuy, P.E. Nissen, R. Peterson, F. Spite