StarCitizen:O-type main-sequence star

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

These are rare objects; it is estimated that there are no more than 20,000 class O stars in the entire Milky Way, around one in 10,000,000 of all stars. Class O main sequence stars are between 15 and 90 M☉ and have surface temperatures between 30,000 and 50,000 K. Their bolometric luminosities are between 30,000 and 1,000,000 L☉. Their radii are more modest at around 10 R☉. Surface gravities are around 10,000 times that of the Earth, relatively low for a main sequence star. Visual absolute magnitudes range from about −4, 3,400 times brighter than the sun, to about −5.8, 18,000 times brighter than the sun.

Class O stars are very young, no more than a few million years old, and in our galaxy they all have high metallicities, around twice that of the sun. O-type main sequence stars in the Large Magellanic Cloud, with lower metallicity, have noticeably higher temperatures, with the most obvious cause being lower mass loss rates. The most luminous class O stars have mass loss rates of more than a millionth M☉ each year, although the least luminous lose far less. Their stellar winds have a terminal velocity around 2,000 km/s.

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