O-type giants

stars of early spectral type

star in the constellation Orion

Meissa , designated Lambda Orionis (λ Orionis, abbreviated Lambda Ori, λ Ori) is a star in the constellation of Orion. It is a multiple star approximately away with a combined apparent magnitude of 3.33. The main components are an O9 giant star and a B-class main sequence star, separated by about 4″. Despite Meissa being more luminous and only slightly further away than Rigel, it appears 3 magnitudes dimmer at visual wavelengths, with much of its radiation emitted in the ultraviolet due to its high temperature.

star system in the constellation Vela

star in the constellation Dorado

star in the constellation Perseus

star

binary star with an X-ray pulsar in the constellation Centaurus

star in the constellation Monoceros

star in the constellation Circinus

Binary black hole-star systems in the constellation Taurus

binary star system in the constellation Perseus

Star

variable star in the constellation Musca

star in the constellation Cygnus

star in the constellation Dorado

star in the constellation Carina

star in the constellation Cygnus

star in the constellation Sagittarius

binary star in the constellation Auriga