Computer Science
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999kfnt...15....3g&link_type=abstract
Kinematika Fiz. Nebesn. Tel, Tom 15, No. 1, p. 3 - 16
Computer Science
2
Stellar Atmospheres: Models, Stellar Atmospheres: Metal-Poor Stars, Stellar Atmospheres: Halo Stars, Stellar Atmospheres: Dwarfs
Scientific paper
Two-dimensional radiative hydrodynamical simulations of the granulation in metal-poor halo dwarfs are analysed and compared with similar solar calculations. A decrease in metallicity was found to reveal itself in the properties of surface layers, playing a role of thermal boundary. As a result, the granulation temperature contrast grows in the lower photosphere, radiative cooling of hot convective upflows is more active in the middle photosphere, and temperature variations increase in the upper photosphere. The amplitudes of atmospheric oscillations become higher and the size distribution of granules is shifted asymmetrically to the range of smaller scales. The photospheric overshooting convection has a strong impact on the energy balance in the lower photosphere with hot convective upflows predominating.
Gadun A. S.
Ploner R. O. S.
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