Ultra-metal-poor Stars: Spectroscopic Determination of Stellar Atmospheric Parameters Using Iron Non-LTE Line Abundances

Ultra-metal-poor Stars: Spectroscopic Determination of Stellar Atmospheric Parameters Using Iron Non-LTE Line Abundances

We present new ultra-metal-poor stars parameters with [Fe/H] < -4.0 based on line-by-line non-local thermodynamic equilibrium (NLTE) abundances using an up-to-date iron model atom with a new recipe for non-elastic hydrogen collision rates. We study the departures from LTE in their atmospheric p...

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Bibliographic Details
Main Authors: Plez, Bertrand, Ezzeddine, Rana, Frebel, Anna L.
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Published: IOP Publishing 2018
Online Access:http://hdl.handle.net/1721.1/114959
https://orcid.org/0000-0002-2139-7145

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