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Observations Bearing on Convection

Published online by Cambridge University Press:  15 February 2018

K.H. Böhm
K.H. Böhm*
Affiliation:
University of Washington, Seattle, WA., U.S.A.

Summary

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  • 1. Solar observations contain a considerable amount of information on the hydrodynamics of stellar convection. We emphasize and discuss especially

  • (a)the existence of two very different cell sizes,

  • (b) the unexpectedly high cross-correlation between vertical velocities and temperature fluctuations in the granulation,

  • (c) the fast "downdrafts" in intergranular regions,

  • (d) the existence of cells much larger than the scale height,

  • (e) the strange behavior of the temperature fluctuations in the supergranulation, and

  • (f) the importance of convective overshoot.

  • 2. The Li-Be problem and its possible relevance as an indicator of convective overshoot is briefly summarized.

  • 3. Convection may have a stronger influence on the observable properties of Herich (“non-DA”) white dwarfs than of most other stars. We discuss especially

  • (a) the persistence of outer convection zones through a very wide range of effective temperatures,

  • (b) the occurence of convection in high layers of the atmosphere,

  • (c) the relatively high efficiency of convection in white dwarf atmospheres, and

  • (d) the relevance of convection to the cooling problem.

Type
III. Observational Aspects
Information
International Astronomical Union Colloquium , Volume 38: Problems of Stellar Convection , 1977 , pp. 103 - 118
Copyright
Copyright © 1976

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