Chromospheric and transition zone parameters in FK comae stars

  • Luciana Bianchi
  • Michael Grewing
Session I: Dynamos and Stellar Activity: Observations
Part of the Lecture Notes in Physics book series (LNP, volume 254)


Optical and ultraviolet data for the fast rotating giants of the FK Comae type have been analyzed to study their chromospheres and Transition Zones. From relative line intensities, electron densities of 1010 to 1011 cm−3 are found for the region where the SiIV emission arises. From the emission measure distribution, we derive an estimate of the sizes of the chromospheres and TZ of these stars. Furthermore, the emission line strengths are compared to what is expected from the rotation-activity correlation that has been established for other late-type stars.


Spot Model Relative Line Intensity High Rotation Velocity Accretion Stream CaII Line 
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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • Luciana Bianchi
    • 1
  • Michael Grewing
    • 2
  1. 1.Osservatorio Astronomico di TorinoPino Torinese (TO)Italy
  2. 2.Astronomisches InstitutTübingen 1Germany

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