Oef stars
type: Concept
broader: Early-type emission stars

Wolf-Rayet stars
type: Concept
broader: Early-type emission stars

Be stars
type: Concept
broader: Early-type emission stars

Early-type emission stars
type: Concept
broader: Emission line stars
broader: Early-type stars
narrower: Oe stars
narrower: Wolf-Rayet stars
narrower: Ae stars
narrower: Oef stars
narrower: Be stars
narrower: Of stars
alternative label: Early type emission stars

Emission line stars
type: Concept
narrower: Early-type emission stars

Early-type stars
type: Concept
narrower: Early-type emission stars

Oe stars
type: Concept
broader: Early-type emission stars

Ae stars
type: Concept
broader: Early-type emission stars

Of stars
type: Concept
broader: Early-type emission stars