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Beta Monocerotis
Beta Monocerotis (Beta Mon, β Monocerotis, β Mon) is a triple star system in the constellation of Monoceros.〔(Beta Mon ), Jim Kaler, ''Stars''. Accessed on line November 21, 2008.〕 To the naked eye, it appears as a single star with an apparent visual magnitude of approximately 3.74, making it the brightest visible star in the constellation.〔 A telescope shows a curved line of three pale blue stars (or pale yellow stars, depending on your scope's focus). William Herschel who discovered it in 1781 commented that it is "one of the most beautiful sights in the heavens". The star system consists of three Be stars, β Monocerotis A, β Monocerotis B, and β Monocerotis C. There is also an additional visual companion star that is probably not physically close to the other three stars.〔
==Beta Monocerotis A==
Beta Monocerotis A (Beta Mon A, β Monocerotis A, β Mon A) is a Be star with a mass of approximately 7 solar masses and a luminosity of 3,200 times the Sun's.〔
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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