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Dredge-up by Sound Wave Emission from a Convective Core

Published online by Cambridge University Press:  12 April 2016

Masa-aki Kondo
Masa-aki Kondo*
Affiliation:
Senshu UniversrityHigashi-mita, Tama-ku, Kawasaki-shi, Kanagawa, 214Japan

Extract

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Concerning the scattering of OB stars in the HR diagram (Humphry 1980), the effects of overshooting of convective core (Maeder 1984), mass loss (cf. chiosi and Maeder 1986), and generous stability criterion of semi-convection (Stothers and Chin 1976) have been discussed. Here, we will note the dredge up effect is caused by the sound waves emitted from a convective core.

The sound mode of nonradial oscillation, with the spherical harmonics Ylm(θ, ϕ) and the frequency ω, can exist in the propagation zone, where the bottom boundary locates at the position of , and the upper boundary does near the photosphere. Here, Ll is called as the Lamb frequency, and cs is the sound velocity.

Type
Part I. Chemical Peculiarities as Probe of Stellar Evolution
Information
International Astronomical Union Colloquium , Volume 108: Atmospherics Diagnostics of Stellar Evolution: Chemical Peculiarity, Mass Loss, and Explosion , 1988 , pp. 99 - 100
Copyright
Copyright © Springer-Verlag 1988

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