Abstract
The principal abnormalities among A-type stars are the metallic-line (Am) and peculiar A (Ap) stars. In these, diffusion (Michaud 1980) occurring in stars rotating at less than about 120km 8 -1allows certain elements to sink and others to rise into the atmosphere. Observationally, all Am and Ap stars are observed to have rotational velocities less than that limit and most of the normal stars have higher rotational velocities. But a large study (Abt&Morrell 1995) showed that 15-20% of the normal stars had lower rotational velocities. Could it be that rotation alone does not determine whether a slow rotator has an abnormal or normal spectrum?
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References
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© 2000 Springer Science+Business Media Dordrecht
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Abt, H.A., Willmarth, D.W. (2000). Does Rotation Alone Determine Whether an A-type Star’s Spectrum is Abnormal or Normal?. In: Cheng, K.S., Chau, H.F., Chan, K.L., Leung, K.C. (eds) Stellar Astrophysics. Astrophysics and Space Science Library, vol 254. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0878-5_21
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DOI: https://doi.org/10.1007/978-94-010-0878-5_21
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