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Title: A MODEL FOR INTERFACE DYNAMOS IN LATE K AND EARLY M DWARFS

Measurements of the equivalent width EW(CaK) of emission in the Ca ii K line have been obtained by Houdebine et al. for stars with spectral types from dK5 to dM4. In order to explain the observed variations of EW(CaK) with spectral sub-type, we propose a quantitative model of interface dynamos in low-mass stars. Our model leads to surface field strengths B{sub s} which turn out to be essentially linearly proportional to EW(CaK). This result is reminiscent of the Sun, where Skumanich et al. found that the intensity of CaK emission in solar active regions is linearly proportional to the local field strength.
Authors:
;  [1] ;  [2]
  1. Department of Physics and Astronomy, University of Delaware, Newark, DE 19716 (United States)
  2. Armagh Observatory, College Hill, Armagh BT61 9DG (United Kingdom)
Publication Date:
OSTI Identifier:
22518893
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 810; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CALCIUM; EMISSION SPECTRA; INTERFACES; MAGNETIC FIELDS; MASS; SUN; VARIATIONS