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Omega2 Aquarii
Omega2 Aquarii (ω2 Aqr, ω2 Aquarii) is the Bayer designation for a triple star〔 system in the equatorial constellation of Aquarius. It can be seen with the naked eye, having an apparent visual magnitude of 4.49.〔 The approximate distance to this star, , is known from parallax measurements taken during the Hipparcos mission.〔
The primary component of this system is a massive, B-type main sequence star with a stellar classification of B9 V.〔 This star has nearly double the radius of the Sun〔 and is spinning rapidly with a projected rotational velocity of 148 km/s.〔 The outer atmosphere has an effective temperature of 10,504 K,〔 giving it the blue-white hue of a B-type star.〔
There is a close orbiting stellar companion of unknown type, with a third component at an angular separation of 5.7 arcseconds. The latter is a K-type main sequence star with a visual magnitude of 9.5.〔 This system is among the 100 strongest stellar X-ray sources within of the Sun. It is emitting an X-ray luminosity of s−1.〔
==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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