| 翻訳と辞書 |
| Przybylski's Star ： ウィキペディア英語版 |
Przybylski's Star
Przybylski's Star , or HD 101065, is a peculiar star that is located at a distance of roughly from the Sun in the southern constellation of Centaurus.
==Scientific history==
In 1961, the Polish-Australian astronomer Antoni Przybylski (Polish pronunciation ) discovered that this star had a peculiar spectrum that would not fit into the standard framework for stellar classification.〔 Przybylski's observations indicated unusually low amounts of iron and nickel in the star's spectrum, but higher amounts of unusual elements like strontium, holmium, niobium, scandium, yttrium, caesium, neodymium, praseodymium, thorium, ytterbium, and uranium. In fact, at first Przybylski doubted that iron was present in the spectrum at all. Modern work shows that the iron-group elements are somewhat below normal in abundance, but it is clear that the lanthanides and other exotic elements are highly overabundant. Lanthanide elements are from 1000 to 10,000 times more abundant than in the Sun. As a result of these peculiar abundances this star belongs firmly in the Ap star class.
Przybylski's Star also contains many different short-lived actinide elements with actinium, protactinium, neptunium, plutonium, americium, curium, berkelium, californium, and einsteinium being detected. Other radioactive elements discovered in this star include technetium and promethium.
Compared to neighboring stars, HD 101065 has a high peculiar velocity of .〔
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「Przybylski's Star」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.
|
|