Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011acasn..52..177x&link_type=abstract
Acta Astronomica Sinica, vol. 52, no. 3, p. 177-179
Astronomy and Astrophysics
Astronomy
Convection, Stars: Atmospheres
Scientific paper
Using a non-local convection theory, both of the local and non-local convective envelope models of evolutionary series of stars with masses from 1 to 30 solar masses are calculated. The problem of supersonic convection is reviewed. The results show that convective velocities in the stellar atmosphere are seriously overestimated by the local mixing-length theory. Convection is strong supersonic in the atmosphere of yellow giants and super-giants in the local mixing-length theory. They, however, become subsonic for the most stars when convection is return to the normal non-local treatment. Convective velocities increase with the increases of the luminosities of stars. There are still weak supersonic convection in few red and yellow giants and super-giants. It is suspected whether this supersonic convection in the stellar atmosphere is true.
Deng Li Cai
Xiong Da-Run
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