Line driven sound waves in early type stars

Details Line driven sound waves in early type stars Line driven sound waves in early type stars

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....75l...7m&link_type=abstract

Astronomy and Astrophysics, vol. 75, no. 3, June 1979, p. L7-L10.

Computer Science

Sound

15

Early Stars, Hot Stars, Ion Acoustic Waves, Sound Waves, Stellar Atmospheres, Stellar Coronas, Acoustic Propagation, Energy Transfer, Gas Expansion, Line Spectra, Magnetohydrodynamic Stability, Plasma Heating, Plasma Resonance, Stellar Spectra, Taylor Instability

Scientific paper

The existence of rapidly growing sound waves in the expanding atmospheres of hot stars is demonstrated. The sound waves are amplified by the velocity dependence of the radiative forces associated with the impurity ion resonance lines. Strong sound waves with a period of 15 minutes to several hours may be expected. The estimated acoustic flux produced by this mechanism is 8 billion erg/sq cm per sec for Zeta Puppis (O4ef) and 700 million erg/sq cm per sec for Epsilon Orionis (B0 Ia). This energy may be sufficient to heat a corona.

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