Evidence of the connection between internal magnetic fields and chromospheric activity in late-type stars

Details Evidence of the connection between internal magnetic fields and chromospheric activity in late-type stars Evidence of the connection between internal magnetic fields and chromospheric activity in late-type stars

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.229..627m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 229, Dec. 15, 1987, p. 627-641. Research supported by t

Astronomy and Astrophysics

Astronomy

7

Chromosphere, Late Stars, Stellar Activity, Stellar Magnetic Fields, Stellar Models, Convection Currents, G Stars, K Stars, Rotating Generators, Stellar Interiors

Scientific paper

In this work an attempt is made 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. An estimate is made, 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 behavior both of the filling factor and the activity indicator R(Ca II+Mg II) 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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