The rotational velocities of magnetic AP stars

Details The rotational velocities of magnetic AP stars The rotational velocities of magnetic AP stars

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..221w&link_type=abstract

Astrophysical Journal, Part 1, vol. 244, Feb. 15, 1981, p. 221-229.

Astronomy and Astrophysics

Astrophysics

47

A Stars, Angular Velocity, Magnetic Stars, Stellar Rotation, Angular Momentum, Astronomical Catalogs, Stellar Evolution, Stellar Magnetic Fields

Scientific paper

New and existing observations of the rotational velocities of Si-type Ap stars in clusters are combined to demonstrate that magnetic stars lose angular momentum after they reach the main sequence. Measurements of field stars provide additional support for this hypothesis. Mechanisms for magnetic braking are discussed, and it is shown that an interaction of the stellar magnetic field with the interstellar medium can account for the observed rate of loss of angular momentum. For Ap stars of later (non-Si) spectral type, it is likely that substantial additional magnetic braking takes place during the pre-main-sequence phase of evolution.

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