Evidence of the connection between internal magnetic fields and chromospheric activity in late-type stars
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1987
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Wiley
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Abstract
In this work we try to establish a connection between the dynamo effect, which operates in the convection zone of late-type stars, and the chromospheric activity observed in these objects. We estímate in a theoretical way, for a sample of main-sequence active stars with spectral types G and K, the magnetic field generated in a region close to the base of the convection zone and the filling factor (fraction of stellar surface covered by strong magnetic fields). The analysis of the behaviour both of the filling factor and the activity indicator R(CaII + MgII) against several stellar parameters ( B-V and the Rossby number) supports the existence of a link between the interior processes and the surface activity.
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© Royal Astronomical Society.
Many thanks are due to Dr Andre Maeder, who kindly sent us his unpublished main-sequence interior models. We also are very grateful to Dr Carole Jordan for her careful reading of the manuscript and for many suggestions to clarify and improve its scientific content. The authors are indebted to an anonymous referee for his valuable comments and suggestions on the first version of this paper. This work has been carried out at the Departamento de Astrofísica of the Universidad Complutense (Madrid), and is a part of the project 'Actividad estelar en estrellas de los últimos tipos espectrales' supported by the Spanish Comisión Asesora de Investigación Científica y Tecnológica (CAICYT No. 2254/83). The financial support to one of the authors (BM) with a grant of the Spanish Ministerio de Educación y Ciencia is gratefully acknowledged.