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Testing 3D solar models against observations .: Center-to-limb variations of oxygen lines, spatially-resolved line formation and probing for departures from LTE
Stockholm University, Faculty of Science, Department of Astronomy. (KVAs inst. f. solfysik)
2009 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, ISSN ISSN 0004-6361, Vol. 80, 650- p.Article in journal (Refereed) Published
Abstract [en]

We present results from a series of observational tests to 3D and 1D solar models. In particular, emphasis is given to the line formation of atomic oxygen lines, used to derive the much debated solar oxygen photospheric abundance. Using high-quality observations obtained with the Swedish Solar Telescope (SST) we study the center-to-limb variation of the O I lines, testing the models and line formation (LTE and non-LTE). For the O I 777 nm triplet, the center-to-limb variation sets strong constraints in the non-LTE line formation, and is used to derive an empirical correction factor (SH) to the classical Drawin recipe for neutral hydrogen collisions. Taking advantage of the spatially-resolved character of the SST data, an additional framework for testing the 3D model and line formation is also studied. From the tests we confirm that the employed 3D model is realistic and its predictions agree very well with the observations.

Place, publisher, year, edition, pages
2009. Vol. 80, 650- p.
Keyword [en]
line: formation, Sun: photosphere, Sun: granulation, Sun: abundances, Convection
Research subject
URN: urn:nbn:se:su:diva-35015DOI: 10.1088/0031-8949/2008/T133/014016OAI: diva2:286139
Available from: 2010-01-13 Created: 2010-01-13 Last updated: 2011-02-15Bibliographically approved

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