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

  • Stars with Thin and Thick Convective Zones
  • Conference paper
  • First Online:
Cool Stars, Stellar Systems, and the Sun

Part of the book series: Lecture Notes in Physics ((LNP,volume 291))

Abstract

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.

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Authors and Affiliations

  1. National Optical Astronomy Observatories, P. 0. Box 26732, 85726, Tucson, AZ

    Sidney C. Wolff

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  1. Sidney C. Wolff
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Jeffrey L. Linsky Robert E. Stencel

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© 1987 Springer-Verlag

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Wolff, S.C. (1987). Activity in stars with shallow convection zones: The early F-type stars. In: Linsky, J.L., Stencel, R.E. (eds) Cool Stars, Stellar Systems, and the Sun. Lecture Notes in Physics, vol 291. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-18653-0_137

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  • DOI: https://doi.org/10.1007/3-540-18653-0_137

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-18653-3

  • Online ISBN: 978-3-540-48041-9

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