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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 AP Columbae ： ウィキペディア英語版 AP Columbae AP Columbae also known as AP Col is a pre-main-sequence star in the constellation of Columba, which has been studied for the last 15 years, but was recently discovered to be very young and close to Earth. It has been recognized as the closest young star to the Earth.〔〔 ==Discovery== AP Columbae was identified as a flare star in 1995; it was discovered as a bright X-ray source in 1999 during a study of bright infra-red point sources from the 2MASS catalogue which did not have an optical counterpart—one of the reasons for an absence of a counterpart would be a large proper motion, which tends to correlate with proximity. Photometry and spectra taken during that work gave an estimate for the intrinsic brightness of the star, which let to a distance estimate of about 6.1 pc. A later work confirmed that the star was nearby, and determined that it was very young. It is at a distance of 27 light years (8.4 pc), a figure calculated by accurate observations of the star's relative movement with respect to the background stars during the course of an Earth year.〔 For many years, scientists were of the opinion that such young stars were present only in very distant star-forming regions like the Orion nebula, but with the advent of new all-sky survey techniques this has proved to be incorrect.〔 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「AP Columbae」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.