Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ncimb.120.1115y&link_type=abstract
Il Nuovo Cimento B, vol. 120, Issue 10, p.1115
Astronomy and Astrophysics
Astrophysics
Scientific paper
The hydrodynamic mechanism of gravitational coupling between seismic vibrations of a star and fluctuations of gas-dust flows in stellar envelope is discussed. Working from a homogeneous model of a spherical stellar cocoon--a star embedded in a thick dusty shell, the self-consistent equations of hydro-gravity, formulated as a counterpart of equations of hydro-magnetic model of interstellar gas-dynamics, are introduced. Particular attention is given to shear oscillations of ambient gas-dust matter triggered by seismic pulsations of a star owing its existence to circumstellar gravitational stresses. It is shown that, in the absence of accretion, the frequency of this gravity-driven mode in circumstellar envelope is proportional to the frequency of the g-mode in the star bulk. The implication of the model to a number of current astrophysical problems is briefly discussed.
Bastrukov Sergey
Molodtsova Irina
Yang Jaek-Jin
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