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Beta Carinae
Beta Carinae (β Car, β Carinae) is the second brightest star in the constellation Carina and one of the brightest stars in the night sky, with apparent magnitude 1.68.〔 It is the brightest star in the south polar asterism known as the Diamond Cross, marking the southwestern end of the asterism. Beta Carinae also has the traditional name Miaplacidus, meaning ''"placid waters"''. It lies near the planetary nebula, IC 2448. Parallax measurements place it at a distance of from Earth.〔
Beta Carinae's traditional name ''Miaplacidus'' made its debut on star maps in 1856 when the star atlas ''Geography of the Heavens'', composed by Elijah Hinsdale Burritt, was published. The meaning and linguistic origin of the name remained an enigma for many decades, until William Higgins, a great scholar and expert on star names, surmised that the name ''Miaplacidus'' is apparently a bilingual combination of Arabic مياه ''miyāh'' for "waters" and Latin ''placidus'' for "placid".
In Chinese, (), meaning ''Southern Boat'', refers to an asterism consisting of β Carinae, V337 Carinae, PP Carinae, θ Carinae and ω Carinae .〔 ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.〕 Consequently, β Carinae itself is known as (, (英語:the Fifth Star of Southern Boat).)〔 (香港太空館 - 研究資源 - 亮星中英對照表 ), Hong Kong Space Museum. Accessed on line November 23, 2010.〕
The stellar classification of A1 III–〔 suggests this is an evolved giant star, although Malagnini and Morossi (1990) rated it as an A2 IV subgiant star.〔 It has an estimated age of 260 million years.〔 This star does not show an excess emission of infrared radiation that might otherwise suggest the presence of a debris disk.〔 It has about 3.5 times the Sun's mass and has expanded to almost seven times the radius of the Sun.〔 Presently is it radiating 288 times as much luminosity as the Sun〔 from its outer envelope at an effective temperature of 8,866 K.〔 Despite its enlarged girth, this star still shows a rapid rotation rate, with a projected rotational velocity of .〔
== 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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