OII Main sequence star

OII Main sequence star

An O-type main-sequence star (O V) is a main-sequence (core hydrogen-burning) star of spectral type O and luminosity class V. These stars have between 15 and 90 times the mass of the Sun and surface temperatures between 30,000 and 50,000 K. They are between 40,000 and 1,000,000 times as luminous as the Sun.

The old Terran Spectral Classification is still used in UAC catalog designations, as the more commonly used Wurgus Star classification does not lend itself for an easy classification.