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Non-LTE oxygen line formation in 3D hydrodynamic model stellar atmospheres

Amarsi, Anish; Asplund, Martin; Collet, Remo; Leenaarts, J

Description

The O I 777 nm lines are among the most commonly used diagnostics for the oxygen abundances in the atmospheres of FGK-type stars. However, they form in conditions that are far from local thermodynamic equilibrium (LTE). We explore the departures from LTE of atomic oxygen, and their impact on O I lines, across the STAGGER-grid of three-dimensional hydrodynamic model atmospheres. For the O I 777 nm triplet, we find significant departures from LTE. These departures are larger in stars with larger...[Show more]

dc.contributor.authorAmarsi, Anish
dc.contributor.authorAsplund, Martin
dc.contributor.authorCollet, Remo
dc.contributor.authorLeenaarts, J
dc.date.accessioned2018-11-29T22:53:35Z
dc.date.available2018-11-29T22:53:35Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/152516
dc.description.abstractThe O I 777 nm lines are among the most commonly used diagnostics for the oxygen abundances in the atmospheres of FGK-type stars. However, they form in conditions that are far from local thermodynamic equilibrium (LTE). We explore the departures from LTE of atomic oxygen, and their impact on O I lines, across the STAGGER-grid of three-dimensional hydrodynamic model atmospheres. For the O I 777 nm triplet, we find significant departures from LTE. These departures are larger in stars with larger effective temperatures, smaller surface gravities, and larger oxygen abundances. We present grids of predicted 3D non-LTE based equivalent widths for the O I 616 nm, [O I] 630 nm, [O I] 636 nm, and O I 777 nm lines, as well as abundance corrections to 1D LTE based results.
dc.format.mimetypeapplication/pdf
dc.publisherBlackwell Publishing Ltd
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleNon-LTE oxygen line formation in 3D hydrodynamic model stellar atmospheres
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume455
dc.date.issued2016
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationU3488905xPUB11611
local.type.statusPublished Version
local.contributor.affiliationAmarsi, Anish, College of Science, ANU
local.contributor.affiliationAsplund, Martin, College of Science, ANU
local.contributor.affiliationCollet, Remo, College of Science, ANU
local.contributor.affiliationLeenaarts, J, Stockholm university
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage3735
local.bibliographicCitation.lastpage3751
local.identifier.doi10.1093/mnras/stv2608
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2018-11-29T07:53:34Z
local.identifier.scopusID2-s2.0-84959138294
local.identifier.thomsonID000368009300026
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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