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半人马座ω

NGC 5139
球狀星團 球狀星團表

半人馬座ω核心的一小塊區域就包含了50,000顆恆星(NASA/STScI)

觀測資料
(曆元 J2000)
分類
星座 半人马座
赤經 13h 26m 45.89s[1]
赤緯 -47° 28′ 36.7″[1]
距離 18.3 ± 1.1 kly[2] (5.6 ± 0.3 kpc)
視星等 (V) +5.33[1]
視直徑(V) 36′.3
物理性質
質量 ( M)
半徑 86 ± 6 ly[3]
VHB
估計年齡 ~12 Gyr[來源請求]
附記
其他名稱 NGC 5139,[1] GCl 24,[1] ω Centauri[2]

半人馬座ωNGC 5139奧米茄星團,中文名库楼增一),是一個曾被誤認為恆星,環繞著銀河系的球狀星團。它是銀河系內最大的球狀星團,於1677年被愛德蒙·哈雷發現,也是迄今所知最大的,且少數能以肉眼看見的。半人馬座ω距離地球約18,300光年,包含有數百萬顆第二星族的恆星,年齡大約120億歲。

半人馬座ω是拜耳命名法的名稱,並不因為不是單獨的恆星而變更傳統的名稱。

在大量觀測之後,發現半人馬座ω不同於其他的球狀星團:首先,它包含幾種不同世代的恆星,在澳洲國立大學天文與天文物理研究所指導研究生的勞拉史丹佛領導學生研究半人馬座ω內的恆星,推測他可能是一個比現在要大數百倍的矮星系核心,被我們的銀河扯碎和吸收掉了。在萊登大學的設計理論模型的格倫范德瓦也認同這種推論。

相關條目

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外部連結

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參考資料

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  1. ^ 1.0 1.1 1.2 1.3 1.4 SIMBAD Astronomical Database. Results for NGC 5139. [2006-11-16]. (原始内容存档于2013-06-24). 
  2. ^ 2.0 2.1 van de Ven, G.; van den Bosch, R. C. E.; Verolme, E. K.; de Zeeuw, P. T. The dynamical distance and intrinsic structure of the globular cluster ω Centauri. Astronomy and Astrophysics. January II 2006, 445 (2): 513–543. 
  3. ^ distance × sin( diameter_angle / 2 ) = 97 ± 6 kly. radius
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半人马座ω
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