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Stellar astronomy > Stellar types > Chemically peculiar stars > Magnetic stars > Am stars
Stellar astronomy > Stellar types > Chemically peculiar stars > Am stars
... > Stellar astronomy > Stellar types > Chemically peculiar stars > Magnetic stars > Magnetic variable stars > Am stars
... > Stellar astronomy > Stellar types > Variable stars > Intrinsic variable stars > Magnetic variable stars > Am stars
Stellar astronomy > Stellar types > Stellar spectral types > A stars > Am stars
Stellar astronomy > Stellar types > Early-type stars > A stars > Am stars

Preferred term

Am stars  

Definition

  • A chemically peculiar A- or early F-type star showing an overabundance of heavy elements and an underabundance of calcium and scandium. An Am star cannot receive a unique spectral type, as different methods (using the metallic lines, the hydrogen Balmer lines, and the calcium Ca II K-lines) yield three different spectral types. Contrarily to Ap stars, Am stars do not have significant external magnetic fields. Their rotational velocities are about 100-120 km s-1 smaller than those of Ap stars. (en)

Broader concept

Entry terms

  • Am-type stars (en)
  • Metallic line stars (en)
  • Metallic-line stars (en)

Contributor

Editorial note

URI

http://astrothesaurus.org/uat/33

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