| 翻訳と辞書 |
| Gamma Trianguli Australis ： ウィキペディア英語版 |
Gamma Trianguli Australis
Gamma Trianguli Australis (γ TrA, γ Trianguli Australis) is a star in the constellation Triangulum Australe. Along with Alpha and Beta Trianguli Australis it forms a prominent triangular asterism that gives the constellation its name (Latin for southern triangle). It is the third brightest member of this constellation with an apparent visual magnitude of +2.87.〔 based upon parallax measurements, Gamma Trianguli Australis is located at a distance of about from Earth.〔
The spectrum of this star matches a stellar classification of A1 V,〔〔 which identifies it as an A-type main sequence star that is generating energy through the nuclear fusion of hydrogen at its core. An unusual abundance of the element europium demonstrates it to be a peculiar, or Ap star.〔 Most stars of this type are slow rotators,〔 but Gamma Trianguli Australis displays a very high rate of rotation with a projected rotational velocity of 199 km s−1.〔 It has an estimated age of 260 million years.〔
This system shows an excess emission of infrared radiation, suggesting that there is a circumstellar disk of dust orbiting this star. The mean temperature of the emission is 50 K, corresponding to a separation from the star of 481 AU.〔
==Modern legacy==
γ TrA appears on the flag of Brazil, symbolising the state of Paraná.〔(【引用サイトリンク】url=http://www.fotw.net/flags/br_astro.html )〕
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「Gamma Trianguli Australis」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.
|
|