Why Are There Normal Slow Rotators among A-type Stars?

Details Why Are There Normal Slow Rotators among A-type Stars? Why Are There Normal Slow Rotators among A-type Stars?

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21336302a&link_type=abstract

American Astronomical Society, AAS Meeting #213, #363.02; Bulletin of the American Astronomical Society, Vol. 41, p.513

Astronomy and Astrophysics

Astronomy

Scientific paper

Michaud (1970) found that main-sequence A-type stars have radiative layers below their atmospheres where diffusion can act and produce Ap and Am stars if their rotational velocities are below 120 km/s. But among field stars there are some normal slow rotators. Why? Studies (Abt 1979) of stars in open clusters of various ages show that the Ap(Si), Ap(HgMn), and Am stars develop their atmospheric abnormalities in a few million years, but the Ap(SrCrEu) stars take about 186 million years to develop their abnormalities. Because they stay on the main sequence only 424 million years, they spend nearly half of their main-sequence lifetimes as normal stars before their peculiarities appear. Numerically that explains the numbers of normal field stars observed.

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