Magnetic structure in cool stars. VI - CA II H and K fluxes from evolved stars

Details Magnetic structure in cool stars. VI - CA II H and K fluxes from evolved stars Magnetic structure in cool stars. VI - CA II H and K fluxes from evolved stars

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...113....1m&link_type=abstract

Astronomy and Astrophysics, vol. 113, no. 1, Sept. 1982, p. 1-8. Research supported by the Nederlandse Organisatie voor Zuiver-

Astronomy and Astrophysics

Astrophysics

36

Cool Stars, Giant Stars, H Lines, K Lines, Stellar Evolution, Stellar Magnetic Fields, Stellar Spectra, Binary Stars, Chromosphere, Dynamo Theory, Stellar Mass, Stellar Rotation

Scientific paper

Quantitative measurements of the Ca II H and K flux of 335 evolved stars are presented and discussed. The results show that there is a large spread in the fluxes from stars with (B-V) less than 0.95 while the Ca II H and K flux of single stars with (B-V) greater than 0.95 correlates with color with little spread. Short-period binaries show a relatively high Ca II H and K flux indicating that high fluxes result from rapid rotation independent of spectral type. The data are consistent with the hypothesis that the emission depends on dynamo action in the convective envelope, the dynamo efficiency decreasing with decreasing rotation rate. The evolution of the emission is discussed as a function of stellar mass. It is shown that stars which leave the main sequence with relatively low or high rotational velocities show relatively low or high emission values, respectively. The flux lasts up to higher (B-V) values for progressively higher masses.

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