Chemically peculiar stars
type: Concept
narrower: Mercury-manganese stars

Magnetic stars
type: Concept
narrower: Mercury-manganese stars

Mercury-manganese stars
modified: 2020-11-10T19:23:39.864Z
modified: 2020-11-10T19:23:49.915Z
contributor: AAS Frey.Katie
type: Concept
broader: Magnetic stars
broader: B stars
broader: Chemically peculiar stars
alternative label: Mercury manganese stars
definition: Chemically peculiar stars of late B-types. The most distinctive features of Mercury-manganese stars are extreme atmospheric overabundance of Hg (up to 5 dex) and of Mn (up to 3 dex). The origin of abundance anomalies observed in late B-type stars with HgMn peculiarity is still poorly understood. More than two thirds of the HgMn stars are known to belong to spectroscopic binaries with a preference of orbital periods ranging from 3 to 20 days.

B stars
type: Concept
narrower: Mercury-manganese stars