斗宿三

斗宿三(人马座μ )
Mu Sagittarii
觀測資料
曆元 J2000.0
星座 人马座
星官
赤經 18h 13m 45.8s
赤緯 −21° 03′ 32″
視星等(V) 3.84/?
距離 > 3600 光年
(> 1100 pc)
光譜分類 B8Ia+B1.5V
其他命名
13 Sagittarii, HR 6812, HD 166937, SAO 186497, HIP 89341, ADS 11169, CCDM 18138-2104

dǒu宿xiù,其拜耳命名法人馬座μ(μ Sgr)。在中國傳統天文學中屬於玄武斗宿南斗六星之一。这个恒星虽然目视波段亮度不高,但其实却是南斗六星中实际光度最大的一个,该星距离远至3600光年且处于星际尘埃浓密的区域内,导致目视波段亮度大幅降低。视星等仅有4等,实际上这颗恒星是一个非常大的超巨星,半径是著名蓝超巨星参宿七的1.5倍,约为120个太阳半径。该星总辐射能量预计为太阳的22.5万倍,从辐射能量估计该星质量在22-26个太阳质量之间.这个恒星的绝对目视星等约为-7.8,如果没有尘埃遮蔽,它将是一个2等星.该星有多颗伴星,其中最主要的是一个B1-2型的高温恒星。尽管这个伴星也是一个大型的恒星,拥有10个太阳质量。但是在超巨星主星的光芒下,伴星难以观测。

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参考

[1]

  1. ^ 伊世同. 中西对照恒星图表. 中国: 科学出版社. 1981: 52. 

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