Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985azh....62.1086p&link_type=abstract
(Astronomicheskii Zhurnal, vol. 62, Nov.-Dec. 1985, p. 1086-1094) Soviet Astronomy (ISSN 0038-5301), vol. 29, Nov.-Dec. 1985, p.
Astronomy and Astrophysics
Astronomy
Acoustic Instability, Hot Stars, Main Sequence Stars, Photosphere, Stellar Atmospheres, Stellar Radiation, Polytropic Processes, Stellar Coronas
Scientific paper
The influence of the radiation flux on the stability of a polytropic convectively stable atmosphere relative to acousto-gravity perturbations is investigated. It is shown that such a medium is unstable in relation to nonadiabatic acoustic waves and is stable in relation to gravity waves. The acoustic instability increment in the subphotospheric layers in hot main-sequence stars is estimated. The time and spatial scales of the most unstable disturbances in stars of spectral classes O5 - F5 have been found. It is noted that acoustic instability of the subphotospheric layers in hot stars can play the same role as the external convective zones in cool stars. In particular, it may be one of the sources of the increased macroturbulence level observed in hot stars' atmospheres and, besides, it may influence the forming of the coronas recently discovered in stars which have no external convective zones.
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