On the nonexistence of the universal magnetic constant for cool stars

Details On the nonexistence of the universal magnetic constant for cool stars On the nonexistence of the universal magnetic constant for cool stars

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99.1292s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Dec. 1987, p. 1292-1297. Research supported by Pols

Astronomy and Astrophysics

Astronomy

3

Cool Stars, Dynamo Theory, Magnetic Flux, Stellar Activity, Stellar Models, Dwarf Stars, Late Stars, Spectral Line Width, Stellar Magnetic Fields, Stellar Rotation, Zeeman Effect

Scientific paper

It is demonstrated that an observational selection effect may be responsible for the constancy of the magnetic flux per unit area of the stellar surface, proposed by Gray (1985). The main-sequence stars of earliest spectral type for which the magnetic field was determined from Zeeman broadening of spectral lines are the fastest rotators, while the average period of rotation decreases toward later spectral type. As a result, the total flux divided by the area of typical dwarfs does not change from star to star, in a good agreement with predictions of the dynamo theory. It is also shown that total observed magnetic flux correlates well with the Rossby number.

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