O-type main-sequence stars

star

stellar classification

five-star system in the constellation Orion

star in the constellation Columba

star in the constellation Auriga

star in the constellation Carina

star in the constellation Orion

contact binary star system

star in the constellation Dorado

binary star system in the constellation Orion

star in the constellation Lacerta

variable star in the constellation Monoceros

star in the constellation Circinus

BD+60°2522 is a bright O-type star that has produced the Bubble Nebula (NGC 7635) with its stellar wind. The exact classification of the star is uncertain, with a number of spectral peculiarities and inconsistencies between the appearance of the star itself and the effects on the nearby nebulosity, but it is undoubtedly a highly luminous hot massive star. Direct spectroscopy yields a spectral class of O6.5 and an effective temperature around . It is a member of the Cassiopeia OB2 stellar association in the Perseus Arm of the galaxy at about 8,500 light-years' distance.

variable star in the constellation Musca

star in the constellation Cygnus

star in the constellation Camelopardalis

star in the constellation Dorado

star in the constellation Centaurus

spectroscopic binary in the constellation Dorado

star

star in the constellation Dorado

binary star system in the constellation Sagittarius

star in the constellation Cassiopeia

Star in the constellation Crux

star in the constellation Carina

binary star in the constellation Ara

star in the constellation Monoceros

star in the constellation Cepheus

star in the constellation Scutum

variable star in the constellation Cygnus