PG 1159 stars
type: Concept
broader: DO stars

White dwarf stars
type: Concept
narrower: DO stars

DO stars
type: Concept
contributor: AAS Frey.Katie Admin
modified: 2020-11-04T21:15:28.753Z
modified: 2020-11-04T21:15:40.28Z
alternative label: DO white dwarf
alternative label: DO white dwarf stars
broader: White dwarf stars
definition: A white dwarf whose spectrum shows strong lines of singly ionized helium He II; He I or H may be present. As a DO star cools, the He II will recombine with free electrons to form He I, eventually changing the DO type into a DB white dwarf.
narrower: PG 1159 stars