O-type main-sequence star
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An O-type main-sequence star is a main-sequence—core hydrogen-burning—star of spectral type O. The spectral luminosity class is V, although class O main sequence stars often have spectral peculiaritie
Sigma Orionis is a rare example of a quintuple star system. The largest star in the system, σ Ori A, is an O-type main-sequence star.
Stellar classification
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In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffrac
O-type main-sequence star
…An O-type main-sequence star is a main-sequence—core hydrogen-burning—star of spectral type O. The spectral luminosity class is V, although class O main sequence stars often have spectral peculiarities due to their extreme luminosity. These…
UGC 5797, an emission-line galaxy where massive bright blue stars are formed
Artist's impression of a Y-dwarf
Image of the carbon star R Sculptoris and its striking spiral structure
Sirius A and B (a white dwarf of type DA2) resolved by Hubble