Activity in stars with shallow convection zones: The early F-type stars

  • Sidney C. Wolff
Stars with Thin and Thick Convective Zones
Part of the Lecture Notes in Physics book series (LNP, volume 291)


Observations of transition region and coronal emission show that the onset of activity in main sequence stars occurs at about spectral type FO or Teff = 7200 K. A few hotter stars are active, but there is no observational evidence of non-radiative heating in most A-type stars. Nearly all F-type stars in the temperature range 6600 K < Teff < 7200 K are active, an unexpected result given their shallow convection zones. In these stars, the total non-radiative flux does not correlate with rotation, Rossby number, or age, and so the bulk of the non-radiative heating in these stars may not be a consequence of stellar dynamos. An alternative possibility is acoustic heating, but acoustic models at the current state of their development cannot account in detail for the observations.


Spectral Type Convection Zone Main Sequence Star Rossby Number Cool Star 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • Sidney C. Wolff
    • 1
  1. 1.National Optical Astronomy ObservatoriesTucson

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