KnowraO-type starLinked fromLinked fromThe 8 pages that link to O-type star, each with the reason it gives.All 8Broader topic 3Related 2Narrower topic 1Compared with 2Wolf–Rayet starCompared with: O-type stars usually retain hydrogen-rich envelopes that Wolf–Rayet stars have partly or largely lost.Harvard spectral classificationBroader topic: O stars occupy the hottest end of the Harvard sequence.Spectral typeBroader topic: O stars anchor the hottest end of the main spectral sequence.Spectral classificationBroader topic: It is the hottest main category in the standard OBAFGKM sequence.Omega NebulaRelated: O-type stars can power the ionization and heating of the nebula's gas.Trapezium ClusterRelated: Massive hot stars in the cluster power the nebula’s ionization and illumination.Beta CentauriCompared with: O-type stars provide a hotter, more extreme comparison for Beta Centauri’s B-type components.Zeta OphiuchiNarrower topic: Its spectral class explains the intense ultraviolet radiation and powerful wind.