3D modeling of stellar atmospheres and the impact on the understanding of the reliability of elemental abundances in stars as tracers of galactic chemical evolution. Issue Volume 9:Issue S298(2013) (6th January 2014)

• Record Type: Journal Article
• Authors: Ludwig, H.-G.; Steffen, M.; Bonifacio, P.; Caffau, E.; Kučinskas, A.; Freytag, B.
• Is Part Of: Proceedings of the International Astronomical Union. Volume 9:Issue S298(2013)
• Page Start: 343
• Page End: 354
• Publication Date: 2014-01-06
• Subjects: stars: late-type, -- stars: atmospheres, -- stars: abundances, -- radiative transfer, -- convection, -- hydrodynamics, -- line: formation; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921313006558
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: We present a critical review of the construction of 3D model atmospheres with emphasis on modeling challenges. We discuss the basic physical processes which give rise to the effects which set 3D models apart from 1D standard models. We consider elemental abundances derived from molecular features, and the determination of the microturbulence with 3D models. The examples serve as illustration of the limitations inherent to 1D, however, also to 3D modeling. We find that 3D models can provide constraints on the microturbulence parameter, and predict substantial corrections for abundances derived from molecular species.