The loss of angular momentum and the evolution of Ap-type stars

Details The loss of angular momentum and the evolution of Ap-type stars The loss of angular momentum and the evolution of Ap-type stars

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202..121w&link_type=abstract

Astrophysical Journal, vol. 202, Nov. 15, 1975, pt. 1, p. 121-126.

Astronomy and Astrophysics

Astrophysics

34

A Stars, Angular Momentum, Momentum Transfer, Stellar Evolution, Stellar Rotation, Astronomical Models, Frequency Distribution, Interstellar Magnetic Fields, Magnetic Effects, Main Sequence Stars, Time Dependence

Scientific paper

There is a correlation between the radius and period for Ap stars in the sense that stars of longer period have larger radii. This result is to be expected if the more slowly rotating Ap stars have evolved farther away from the zero-age main sequence than Ap stars with more rapid rotation. It is shown that the period-frequency distribution of the non-Si Ap stars, the correlation of radius with period, and the absence of Si stars with periods longer than 20 days can all be accounted for if the time required for magnetic deceleration to reduce rotational velocities to values less than 10 km/sec is on the order of several hundreds of millions of years.

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