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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク NML Cygni ： ウィキペディア英語版 NML Cygni NML Cygni or V1489 Cygni is a red hypergiant and one of the largest stars currently known with a radius about 1,650 times the Sun's, equal to a diameter of 15.3 astronomical units. Its distance from Earth is estimated to be around 1.6 kpc, about 5,300 light-years.〔 NML Cygni is a part of the Cygnus OB2 association, one of the closest massive associations to the Sun, spanning nearly 2° on the sky or ∼30 pc in radius at the distance of 1.74 ± 0.2 kpc.〔 ==Observational history== NML Cygni was discovered in 1965 by Neugebauer, Martz, and Leighton who described two extremely red luminous stars, their colour being described as consistent with a black body temperature of 1,000 K. The name NML comes from the names of these three discoverers. The second star was briefly referred to as NML Tauri but is now known as IK Tauri, an M9 Mira variable. NML Cygni has since also been given the designation V1489 Cygni on account of the small semi-regular brightness variations, but is still most commonly referred to as NML Cygni. Its composition began to be revealed with the discovery of OH masers (1612 MHz) in 1968. Molecules like , , , , , , , and have also been detected. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「NML Cygni」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.