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Microturbulence: Age Dependences

Published online by Cambridge University Press:  12 April 2016

R. Foy
R. Foy*
Affiliation:
Observatoire de Paris, 92190 Meudon/France

Extract

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The study of microturbulence in stars for itself, and not as a byproduct of abundance determinations, is relatively recent. The first comprehensive study on this topic was carried out in 1966, by Bonsak and Culver. They found general trends of the behaviour of microturbulence in the HR diagram. A decisive advance occured when ttarz and Kock (1969) revised the scale of oscillator strengths of iron and, as a consequence, the value of the microturbulent velocity in the solar photosphere. The use of microturbulent velocities determined before 1969 should be avoided.

Before describing what we know about the behaviour of microturbulence with stellar age, I shall make some statements, and describe how the microturbulent velocity is found, from observations, to depend on the atmospheric parameters.

Type
2. Observed Properties of Stellar Turbulence
Information
International Astronomical Union Colloquium , Volume 51: Stellar Turbulence , 1980 , pp. 164 - 169
Copyright
Copyright © Springer-Verlag 1980

References

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