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Iota Orionis
Iota Orionis (ι Ori, ι Orionis) is a star in the equatorial constellation of Orion the hunter. The apparent visual magnitude of Iota Orionis is 2.77,〔 making it the eighth brightest member of Orion. It is the brightest star in an asterism known as Orion's sword. Iota Orionis has the traditional names Hatsya or Hatysa〔 Kunitzsch traces the name to Becvar's ''Atlas Coeli'' (1951), where it appeared as "Hatysa", but was unable to find an older source.〕〔 and in Arabic, Na’ir al Saif, which means simply "the Bright One of the Sword."〔 From parallax measurements, it is located at a distance of roughly from Earth.〔
Iota Orionis is a quadruple system dominated by a massive spectroscopic binary with an eccentric (e=0.764), 29-day orbit. The binary is composed of a stellar class O9 III star (blue giant) and a class B0.8 III/IV star, with the secondary being about 2 magnitudes fainter.〔 The collision of the stellar winds from this pair makes the system a strong X-ray source. Oddly, the two objects of this system appear to have different ages, with the secondary being about double the age of the primary. In combination with the high eccentricity of their orbit, this suggests that the binary system was created through a capture, rather than by being formed together and undergoing a mass transfer. This capture may have occurred, for example, through an encounter between two binary systems.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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