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Departures from LTE for neutral Li in late-type stars
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2009 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 503, no 2, 541-544 p.Article in journal (Refereed) Published
Abstract [en]

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 T-eff = [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.

Place, publisher, year, edition, pages
2009. Vol. 503, no 2, 541-544 p.
Keyword [en]
stars: abundances, stars: late-type, line: formation
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-128271DOI: 10.1051/0004-6361/200912221ISI: 000269726200023OAI: oai:DiVA.org:uu-128271DiVA: diva2:331043
Available from: 2010-07-21 Created: 2010-07-20 Last updated: 2010-07-21Bibliographically approved

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