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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 NGC 6811 ： ウィキペディア英語版 NGC 6811 NGC 6811 is an open cluster in the constellation of Cygnus, near the constellation of Lyra. It has an angular size half that of the full Moon and includes about 1000 stars of roughly similar magnitude.〔〔 It has also been called "The Hole in the Cluster" because of its dark center. ==Features== NGC 6811 lies far away from the galactic plane, a feature it shares with many other old open clusters.〔 It is 1107 ± 90 parsecs distant, 14–20 light years across,〔〔 and has a total luminosity of 2100 suns.〔 Approximately 1.00 ± 0.17 billion years old, it probably contained some 6000 stars at birth,〔 but gravitational interactions and stellar evolution have since reduced the number to 1000.〔 The spectral types of most of its stars range from mid-F to early-K, with surface temperatures relatively similar to the Sun's;〔 the rest include A2-types,〔 several O-types, and more than 100 B-types.〔 Sixteen stars have been observed to vary in brightness, twelve of which are Delta Scuti variables. Its Trumpler classification is III 1r—it is "a rich cluster with equally bright stars with no noticeable central concentration".〔 The stars do, however, have an unusual (if not concentrated) distribution, with an apparent corona surrounding the core, leaving the impression of a hole.〔 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「NGC 6811」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.