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WR 136, a WN6 star where the atmosphere shed during the red supergiant phase has been shocked by the hot, fast WR winds to form a visible bubble nebula. In 1867, using the 40 cm Foucault telescope at the Paris Observatory, astronomers Charles Wolf and Georges Rayet [1] discovered three stars in the constellation Cygnus (HD 191765, HD 192103 and HD 192641, now designated as WR 134, WR 135, and ...
Star system ← ← Nebula Median distance () Stars in system Spectral type Apparent magnitude (V) Comments and references Gamma² Velorum (WR 11/Suhail al Muhlif/Regor) : 1096 +26
Wolf–Rayet (WR) can mean: Wolf–Rayet star, a type of evolved, massive star; Wolf–Rayet galaxy, which contains large numbers of Wolf–Rayet stars; Wolf–Rayet nebula, which surrounds a Wolf–Rayet star
Ordered by right ascension, WR 1 is the first star in the Seventh Catalogue of galactic Wolf-Rayet stars. [ 9 ] WR 1 is a member of the nitrogen sequence of WR stars and has a spectrum with He II lines much stronger than He I lines, and N V emission more than twice the strength of N III , leading to the assignment of a WN4 spectral type.
WR 136 is a Wolf–Rayet star located in the constellation Cygnus. It is in the center of the Crescent Nebula. Its age is estimated to be around 4.7 million years and it is nearing the end of its life. Within a few hundred thousand years, it is expected to explode as a supernova. [8]
WR 140 is a visually moderately bright Wolf–Rayet star placed within the spectroscopic binary star, SBC9 1232, [7] whose primary star is an evolved spectral class O4–5 star. [7] It is located in the constellation of Cygnus , lying in the sky at the centre of the triangle formed by Deneb , γ Cygni and δ Cygni .
Weak-lined Wolf-Rayet stars often have hot luminous companions which dilute the emission. WR 2 does have a companion, but it is much fainter than the primary and not thought to be the cause of the weak-lined spectrum. [5] WR 2 is the smallest and hottest WN star known in the galaxy.
The primary star is a Wolf–Rayet star (abbreviated as WR), which has a B0.5 main sequence star in close orbit and another more distant fainter companion. The WR star is surrounded by a distinctive spiral Wolf–Rayet nebula, often referred to as a pinwheel nebula. The rotational axis of the binary system, and likely of the two closest stars ...