Non-LTE iron abundances in cool stars: The role of hydrogen collisions

In the aim of determining accurate iron abundances in stars, this work is meant to empirically calibrate H‐collision crosssections with iron where no quantum mechanical calculations have been published yet. Thus, a new iron model atom has been developed which includes hydrogen collisions for excitat...

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Bibliographic Details
Published in:Astronomische Nachrichten 2016-09, Vol.337 (8-9), p.850-854
Main Authors: Ezzeddine, R., Merle, Th, Plez, B.
Format: Article
Language:English
Subjects:
Astrophysics
atomic processes
Calibration
Charge transfer
Collisions
HD 140283
Hydrogen
Hydrogen storage
Iron
line: formation
Mathematical models
Metallicity
Physics
Solar and Stellar Astrophysics
Stars
Stars & galaxies
stars: abundances
stars: individual (α Cen A
stars: individual (α Cen A, HD 140283)
stars: late-type
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Summary:In the aim of determining accurate iron abundances in stars, this work is meant to empirically calibrate H‐collision crosssections with iron where no quantum mechanical calculations have been published yet. Thus, a new iron model atom has been developed which includes hydrogen collisions for excitation, ionization, and charge transfer processes. We show that collisions with hydrogen leading to charge transfer are important for an accurate non‐LTE modeling. We apply our calculations on several benchmark stars including the Sun, the metal‐rich star α Cen A, and the metal‐poor star HD 140283.
ISSN:0004-6337
1521-3994
DOI:10.1002/asna.201612384