Concept information
Terme préférentiel
Am-type star
Définition(s)
- An Am star, also known as a metallic-line star, is a type of A star whose spectrum has strong and often variable absorption lines of some metals (hence the "m"), such as zinc, strontium, zirconium, and barium, more typical of an F star, and deficiencies of others, such as calcium and/or scandium. These abundance anomalies are due to some elements being pushed to the surface because they are better light-absorbers, while other elements sink to lower levels under gravity – an effect that requires slow stellar rotation. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/A/Astar.html)
Concept(s) générique(s)
Traductions
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français
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étoile Am
URI
http://data.loterre.fr/ark:/67375/MDL-R34W98GD-J
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