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Terzan 7
Terzan 7 is a sparse and young globular cluster that is believed to have originated in the Sagittarius Dwarf Spheroidal Galaxy (Sag DEG) and is physically associated with it. It is relatively metal rich with [Fe/H = -0.6 and an estimated age of 7.5 Gyr.〔 Terzan 7 has low levels of nickel ([Ni/Fe]=-0.2) which supports its membership in the Sag DEG system since it has a similar chemical signature. It has a rich population of blue stragglers that are strongly concentrated toward the center of Terzan 7. It has an average luminosity distribution of Mv = -5.05. It has a half-light radius (Rh) = 6.5pc. ==History== Terzan 7 was the brightest〔 of six globulars discovered by the French astronomer Agop Terzan in 1968.
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「Terzan 7」の詳細全文を読む
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