Digitale Medien
Springer
Astrophysics and space science
95 (1983), S. 1-9
ISSN:
1572-946X
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract The meridional circulation is considered in the surface layers of the stars where the optical depth τ≲1. It is shown that the radial component of circulation velocity reaches its maximum value at τ≈1 and decreases at τ→0. The tangential velocity reverses its sign at τ≈1 — i.e., the meridional flows are closed in stellar atmospheres. The tangential velocities can be of the order of 106–107 cm s−1 in atmospheres of O-B-A stars. Such hydrodynamical motions can result in the generation of turbulence in the surface layers. Characteristic turbulent velocities are of the order of 105–106 cm s−1 in early-type stars. The small-scale turbulent motions generate the acoustic waves and the flux of such waves may be the source of energy to heat coronae in O and B stars.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00661151
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