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Was (wer) ist O-type main-sequence star - definition
O-type main-sequence star
STELLAR CLASSIFICATION
Type O V star; O v star; O V star; O-type main sequence; O-type 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.
O-type star
![The [[Trifid Nebula]] (M20) is sculpted and lit by the luminous O7.5III star visible at its centre in this infrared image.](https://commons.wikimedia.org/wiki/Special:FilePath/M20 nebula.jpg?width=200 "The [[Trifid Nebula]] (M20) is sculpted and lit by the luminous O7.5III star visible at its centre in this infrared image.")
![Alnitak is a triple star system with an O9.7 supergiant and an O9 giant as well as a B0 giant. These stars illuminate the nearby [[Flame Nebula]].](https://commons.wikimedia.org/wiki/Special:FilePath/Ngc2024 2mass.jpg?width=200 "Alnitak is a triple star system with an O9.7 supergiant and an O9 giant as well as a B0 giant. These stars illuminate the nearby [[Flame Nebula]].")
![Structure of low-mass, intermediate-mass, and high-mass stars. M indicates [[solar mass]]es.](https://commons.wikimedia.org/wiki/Special:FilePath/Star types.svg?width=200 "Structure of low-mass, intermediate-mass, and high-mass stars. M indicates [[solar mass]]es.")
![The brightest star in the [[Trapezium cluster]] is O7V star θ1 Orionis C. The other three are B0.5 and B1 main-sequence stars.](https://commons.wikimedia.org/wiki/Special:FilePath/Trapezium cluster optical and infrared comparison.jpg?width=200 "The brightest star in the [[Trapezium cluster]] is O7V star θ1 Orionis C. The other three are B0.5 and B1 main-sequence stars.")
STELLAR CLASSIFICATION
O star; Type-O star; O-type Stars; O-type stars
An O-type star is a hot, blue-white star of spectral type O in the Yerkes classification system employed by astronomers. They have temperatures in excess of 30,000 kelvin (K).
F-type main-sequence star
STELLAR CLASSIFICATION
Yellow-white dwarfs; Yellow-white dwarf; F-type star; F v star; F-type main sequence; F-type dwarf; F V star; F-type main sequence star; F-type main-sequence stars; Class F star
An F-type main-sequence star (F V) is a main-sequence, hydrogen-fusing star of spectral type F and luminosity class V. These stars have from 1.
