Magnetic braking in cool dwarfs

Details Magnetic braking in cool dwarfs Magnetic braking in cool dwarfs

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92.1178v&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 92, Nov. 1986, p. 1178-1182.

Astronomy and Astrophysics

Astronomy

18

Angular Momentum, Cool Stars, Dwarf Stars, Magnetic Effects, Momentum Transfer, Stellar Winds, Angular Velocity, Atmospheric Temperature, Braking, Cataclysmic Variables, Coronal Loops

Scientific paper

The authors discuss the thermocentrifugal wind theory of Mestel (1968) and Mestel and Spruit (1986). The theory is consistent with the vrot ∝ t-1/2 law, if the coronal temperature increases with rotation velocity as recent observations suggest. The authors present a generalized form for the braking law using the empirical relation Ro = 0.94 t91/2 for the Rossby number, where t9 is the age in units of 109yr, and discuss the observed deviations from this relation. Theoretical models (involving angular-momentum loss) of contact binaries and cataclysmic variables are also compared with this prediction.

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