Abstract
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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,
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(b)
the unexpectedly high cross-correlation between vertical velocities and temperature fluctuations in the granulation,
-
(c)
the fast “downdrafts” in intergranular regions,
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(d)
the existence of cells much larger than the scale height,
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(e)
the strange behavior of the temperature fluctuations in the supergranulation, and
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(f)
the importance of convective overshoot.
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2.
The Li-Be problem and its possible relevance as an indicator of convective overshoot is briefly summarized.
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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
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(a)
the persistence of outer convection zones through a very wide range of effective temperatures,
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(b)
the occurence of convection in high layers of the atmosphere,
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(c)
the relatively high efficiency of convection in white dwarf atmospheres, and
-
(d)
the relevance of convection to the cooling problem.
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Böhm, K. (1977). Observations bearing on convection. In: Spiegel, E.A., Zahn, JP. (eds) Problems of Stellar Convection. Lecture Notes in Physics, vol 71. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-08532-7_35
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