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娄宿增六

娄宿增六
Diagram showing star positions and boundaries of the Triangulum constellation and its surroundings
娄宿增六的位置 (红圈处)
观测资料
历元 J2000.0
星座 三角座
星官 娄宿
赤经 01h 53m 04.90710s
赤纬 +29° 34′ 43.7801″
视星等(V) +3.42
特性
光谱分类F6IV
U−B 色指数+0.06
B−V 色指数+0.48
变星类型旋转椭球变星
天体测定
径向速度 (Rv)–12.6 km/s
自行 (μ) 赤经:10.82 mas/yr
赤纬:–234.24 mas/yr
视差 (π)51.50 ± 0.23 mas
距离63.3 ± 0.3 ly
(19.42 ± 0.09 pc)
绝对星等 (MV)1.98
详细资料
三角座α A
质量1.7 M
半径3 R
温度6,288 K
金属量 [Fe/H]–0.09 dex
自转速度 (v sin i)81.6 km/s
年龄1.6 Gyr
三角座α B
质量0.11 M
其他命名
Mothallah, Metallah, Ras al Muthallah,
Elmuthalleth, Caput Trianguli,
2 Trianguli, HR 544,
HD 11443, BD+28 312,
FK5 64, HIP 8796,
SAO 74996, GC 2272,
CCDM 01531+2935

娄宿增六 (α Tri/三角座α),是位于三角座联星。它的传统名字是 MothallahRas al MuthallahCaput Trianguli,来自于涵义为"三角形的头"的词组和词汇。

特性

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估计这个系统的合并恒星分类从F5III到F6IV,亮度分类‘IV’或‘III’代表主星是一个次巨星巨星。它是一个密近的光谱联星的成员,它们以1.736天的周期绕行它们的共同质心。因为主星快速自转,呈现扁球体。该星受到伴星引力影响被拉伸成椭球体,从地球观察,在轨道周期间变化亮度,这种恒星就是椭球变星。在数百万年内,随着主星持续向红巨星演化,该系统可能会变成半接触双星,填满并溢出洛希瓣

这对双星平均视星等3.42,可以用肉眼看见。它在这个较暗淡的星座中是第二亮星,仅次于天大将军九视差测量显示该系统距离地球63光年。主星的表面温度6,288K,散发出白色的光芒。它的半径大约是太阳的3倍。这个系统估计年龄大约16亿年。

外部链接

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娄宿增六
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