Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...121..190c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 121, no. 2, May 1983, p. 190-197. Sponsorship: Consiglio Nazionale delle Ricer
Astronomy and Astrophysics
Astrophysics
36
Calcium, Chromosphere, Main Sequence Stars, Stellar Atmospheres, Stellar Radiation, Stellar Rotation, Angular Momentum, Dynamo Theory, Emission Spectra, Stellar Evolution, Stellar Magnetic Fields, Stellar Mass
Scientific paper
Using published data on the Ca II K emission and rotation periods, correlations of these quantities with stellar parameters are analyzed in late main sequence stars (F8-K5). The total power emission in the Ca II K line, L(k), is found to follow (1) an exponential decay, with the rotation period not dependent on the spectral type; (2) an exponential decay with the square root of the age; (3) a power law with the mass. Combining these dependences, it can be shown that the rotation period depends only on the mass and age of the stars. Implications on the stellar angular momentum evolution and on the magnetic field generation by dynamo mechanism are discussed.
Catalano Santo
Marilli Ettore
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