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Gamma Velorum is a quadruple star system in the constellation Vela.This name is the Bayer designation for the star, which is Latinised from γ Velorum and abbreviated γ Vel.At a combined magnitude of +1.72, it is one of the brightest stars in the night sky, and contains by far the closest and brightest Wolf–Rayet star.
It has the Bayer designation w Velorum, while HD 77258 is the identifier from the Henry Draper Catalogue. The system is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.45. [ 2 ]
Also lying close to Gamma, [21] V Velorum is a Cepheid of spectral type F6-F9II ranging from magnitude 7.2 to 7.9 over 4.4 days. [22] AI Velorum is located 2.8 degrees north-northeast of Gamma, [ 19 ] a Delta Scuti variable of spectral type A2p-F2pIV/V that ranges between magnitudes 6.15 and 6.76 in around 2.7 hours.
It has the Bayer designation of a Velorum, while HD 75063 is the identifier from the Henry Draper Catalogue. This is a naked-eye star with an apparent visual magnitude of 3.87 [ 2 ] and has a white hue.
HD 89890 is the brightest member of a multiple star system with at least four components, [4] located in the southern constellation of Vela. It is visible to the naked eye with an apparent visual magnitude of 4.50. [3] The annual parallax shift of 2.6 mas [2] provides a distance estimate of around 1,200 light-years (370 parsecs).
It is a massive object – over 15 times the mass of the Sun – and is around 10 million years old. [4] The star has a high rate of spin, showing a projected rotational velocity of 169 km/s. [ 6 ] Its companion, at magnitude +6.08, is located at an angular separation of 0.8 ″ along a position angle of 139°, as of 2008.
[4] The orbital period of the system is 8.964 days, with the neutron star being eclipsed for about two days of each orbit by HD 77581. It has been given the variable star designation GP Velorum, and it varies from visual magnitude 6.76 to 6.99. [5] The spin period of the neutron star is about 283 seconds, and gives rise to strong X-ray pulsations.
WR 104 is a triple star system located about 2,580 parsecs (8,400 ly) from Earth. 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 ...