Am star
(metallic-line star)
(A-type star with metallic lines)
An Am star is an A-type star that has other
than the usual metal absorption lines,
having more strength in the
zinc, strontium, zirconium, and barium spectral lines
and less for calcium and scandium.
One cause seems to be slower than typical rotation,
possibly due to a binary companion.
Sirius A is an Am star.
(star type)
Further reading:
https://en.wikipedia.org/wiki/Am_star
https://www.daviddarling.info/encyclopedia/A/Astar.html
http://dictionary.obspm.fr/index.php?showAll=1&formSearchTextfield=Am+star
Referenced by pages:
chemically peculiar star (CP star)
rare designator prefixes
Sirius
spectral type
Index