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・ Ngeanges
・ Ngebedech Terraces
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・ Ngecha
・ Ngee Ann
・ Ngee Ann City
・ Ngee Ann Cultural Centre
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・ NGC 6782
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NGC 6791
・ NGC 68
・ NGC 68 group
・ NGC 6811
・ NGC 6818
・ NGC 6819
・ NGC 6820 and NGC 6823
・ NGC 6822
・ NGC 6826
・ NGC 6834
・ NGC 6845
・ NGC 6850
・ NGC 6861
・ NGC 6866
・ NGC 6871


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NGC 6791 : ウィキペディア英語版
NGC 6791

NGC 6791 is an open star cluster in the Lyra constellation.〔(【引用サイトリンク】 title =SIMBAD query result: NGC 6791 -- Open (galactic) Cluster )〕 It was discovered by Friedrich August Theodor Winnecke in 1853. At roughly 8 billion years old, and with an Iron to Hydrogen abundance ratio that is more than twice that of the Sun, it is one of the oldest and most metal-rich clusters in the Milky Way. This is contrary to the typical rule-of-thumb where older means more metal-poor. Compounded with the fact that it has an unusually high population of stars, ''NGC 6791'' is among the most studied clusters in the sky.
==Age studies==
Among the dimmest stars in the cluster are groups of white dwarfs that are 6 billion years old and another group that appear to be 4 billion years old. The ages are out of sync with those of the cluster's normal stars, which are 8 billion years old. This seeming contradiction in age for this cluster has been studied and a solution proposed with age of about 8 billion years.

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 6791」の詳細全文を読む



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