H II galaxy
kahkešân-e H II
Fr.: galaxie H II
A low-mass and → metal-poor galaxy
(1/30-1/3 Zsun), experiencing strong
episodes of → star formation,
characterized by the presence of bright → emission lines
on a faint → blue continuum.
The fact that H II galaxies are metal poor and very blue objects seems
to suggest that they are young. Nevertheless, several studies
show the existence of an → old stellar population
present → star burst
in most of these galaxies. This fact indicates that these
objects are not young systems forming their first generation of
stars. Same as → blue compact dwarf galaxy.