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| Paper: |
Non-LTE Analysis of zYJ-band Spectra of Cepheids |
| Volume: |
529, RR Lyrae/Cepheid 2019: Frontiers of Classical Pulsators |
| Page: |
86 |
| Authors: |
Przybilla, N.; Butler, K.; Ebenbichler, A.; Urbaneja, M. A. |
| Abstract: |
We study non-LTE effects on the spectral line-formation in Galactic
Cepheids. The focus is on the short near-IR bands from 900 to 1350 nm. A hybrid
non-LTE approach is chosen, based on standard LTE model atmospheres
and subsequent non-LTE line-formation calculations. Neutral hydrogen,
carbon, nitrogen, and oxygen are investigated, and the neutral/singly-ionized
stages of magnesium. Overall, highly significant non-LTE
effects are found, impacting both the outcome of the atmospheric
parameter determination and elemental abundance analysis. The non-LTE
strengthening of individual lines can give rise to abundance corrections
of up to –0.7 dex. |
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