Astrophysics and Space Science

, Volume 10, Issue 1, pp 136–149 | Cite as

Physical conditions in the convective envelope of stars

II: Convection in critical conditions
  • V. Castellani
  • L. Puppi
  • A. Renzini
Article

Summary

The mechanical flux originating in the convective envelope of stars is shown to depend critically by the treatment of convection. In particular, in the framework of the mixing-length theory, in passing from a mixing lengthl=HP to a mixing lengthl=Hϱ the presence of mechanical fluxes shifts from being a marginal phenomenon to a dominant one.

Possible implications concerning atmospheric microturbulence in Main Sequence stars, as so asAp andAm stars, several types of variables and mass loss are briefly discussed.

Keywords

Convection Physical Condition Mass Loss Main Sequence Main Sequence Star 

Sommario

Si mostra come il flusso cinetico originato negli inviluppi convettivi di una stella dipenda criticamente dalle assunzioni fatte nel trattamento della convezione superadiabatica. In particolare, sulla base della teoria della lunghezza di rimescolamento, a seconda che si assumal=HPol=Hϱ i flussi cinetici passano dall'essere un fenomeno marginale a contributi determinanti.

E' discussa una serie di possibili implicazioni riguardanti la microturbolenza atmosferica in stelle di sequenza principale, le stelleAp eAm, diversi tipi di variabili e la perdita di massa in fase di gigante.

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Copyright information

© D. Reidel Publishing Company 1971

Authors and Affiliations

  • V. Castellani
    • 1
  • L. Puppi
    • 2
  • A. Renzini
    • 2
  1. 1.Istituto di FisicaUniversità di Roma, Laboratorio di AstrofisicaFrascatiItaly
  2. 2.Osservatorio AstronomicoBolognaItaly

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