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Departures from LTE for neutral Li in late-type stars

Lind, K; Asplund, Martin; Barklem, Paul S

Description

We perform non-LTE calculations of lithium in late-type stars for a wide range of stellar parameters, including quantum mechanical cross-sections for collisions with neutral hydrogen and the negative hydrogen ion. Non-LTE abundance corrections for the lithium resonance line at 670.7 nm and the subordinate line at 610.3 nm, are calculated using 1D MARCS model atmospheres spanning a grid Teff = [4000, 8000] K, log g = [1.0,5.0], and [Fe/H] = [0.0, -3.0], for lithium abundances in the range A (Li)...[Show more]

dc.contributor.authorLind, K
dc.contributor.authorAsplund, Martin
dc.contributor.authorBarklem, Paul S
dc.date.accessioned2015-12-13T22:48:55Z
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/1885/80295
dc.description.abstractWe perform non-LTE calculations of lithium in late-type stars for a wide range of stellar parameters, including quantum mechanical cross-sections for collisions with neutral hydrogen and the negative hydrogen ion. Non-LTE abundance corrections for the lithium resonance line at 670.7 nm and the subordinate line at 610.3 nm, are calculated using 1D MARCS model atmospheres spanning a grid Teff = [4000, 8000] K, log g = [1.0,5.0], and [Fe/H] = [0.0, -3.0], for lithium abundances in the range A (Li) = [-0.3,4.2]. The competing effects of ultraviolet over-ionization and photon losses in the resonance line govern the behaviour of the non-LTE effects with stellar parameters and lithium abundance. The size and sign of the non-LTE abundance corrections vary significantly over the grid for the 670.7 nm line, but are typically positive and below 0.15 dex for the 610.3 nm, line. The new collisional data play a significant role in determining the abundance corrections.
dc.publisherSpringer
dc.sourceAstronomy and Astrophysics
dc.subjectKeywords: Abundances - stars; Competing effects; Formation; Hydrogen ions; Late-type; Late-type stars; Lithium resonance lines; Model atmosphere; Neutral hydrogen; Non-LTE; Photon loss; Quantum mechanical; Resonance line; Stellar parameters; Hydrogen; Photoionizati Abundances-stars; Formation; Late-type-line; Stars
dc.titleDepartures from LTE for neutral Li in late-type stars
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume503
dc.date.issued2009
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationf5625xPUB8573
local.type.statusPublished Version
local.contributor.affiliationLind, K, European Southern Observatory
local.contributor.affiliationAsplund, Martin, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBarklem, Paul S, Uppsala Astronomical Observatory
local.description.embargo2037-12-31
local.bibliographicCitation.issue2
local.bibliographicCitation.startpage541
local.bibliographicCitation.lastpage544
local.identifier.doi10.1051/0004-6361/200912221
dc.date.updated2016-02-24T09:43:00Z
local.identifier.scopusID2-s2.0-71849090669
CollectionsANU Research Publications

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