Mercury-manganese stars

Alternative definitions (3), class: vernacular (0)
Term: Mercury-manganese stars

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.

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan