Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258..628b&link_type=abstract
Astrophysical Journal, Part 1, vol. 258, July 15, 1982, p. 628-638.
Astronomy and Astrophysics
Astrophysics
24
Abundance, Emission Spectra, Magnesium, Metallic Stars, Resonance Lines, Stellar Rotation, Atmospheric Heating, Binary Stars, Chromosphere, F Stars, G Stars, Radial Velocity, Radiant Flux Density, Stellar Gravitation, Stellar Spectra, Stellar Temperature
Scientific paper
In many investigations, a study of the Mg II 2800 A emission was conducted in order to derive more information about the correlation of chromospheric emission with the properties of the convection zone. It has been suggested by Ayres and Linsky (1980) that there is a positive correlation between rotation and chromospheric emission at least for binary stars. The present investigation is concerned with such a correlation between rotation and chromospheric emission. Since large differences in rotational velocities are observed for F stars for which also strong chromospheric emission is observable, this particular study deals mainly with F stars. On the basis of observations of the Mg II emission in F and G stars, it is found that the emission is abnormally strong in close binary F stars. This may be explained by the generation of a large differential rotation due to tidal effects which may give very efficient dynamo generation of a surface magnetic field.
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