Non-LTE Line Formation in the Near-IR: Hot Stars
Norbert Przybilla
TL;DR
This paper discusses the challenges of modeling spectral lines in the near-infrared for hot stars due to amplified non-LTE effects, highlighting the complexities in accurate line formation calculations.
Contribution
It provides an introduction to the modeling problems and discusses examples of near-IR line formation for hydrogen and helium in hot stars.
Findings
Non-LTE effects significantly amplify in the Rayleigh-Jeans tail for hot stars.
Modeling near-IR spectral lines requires careful consideration of non-LTE effects.
Examples illustrate the complexity of hydrogen and helium line formation in this context.
Abstract
Line-formation calculations in the Rayleigh-Jeans tail of the spectral energy distribution are complicated by an amplification of non-LTE effects. For hot stars this can make quantitative modelling of spectral lines in the near-IR challenging. An introduction to the modelling problems is given and several examples in the context of near-IR line formation for hydrogen and helium are discussed.
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