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阁道四

阁道四(仙后座μA/B)
观测资料
历元 J2000
星座 仙后座
星官 阁道(奎宿)
赤经 01h08m16.4s
赤纬 +54°55′13″
视星等(V) 5.17/11
特性
光谱分类G5VIp/M5V
U−B 色指数0.10
B−V 色指数0.69
变星类型Suspected
天体测定
径向速度 (Rv)-98.1 km/s
自行 (μ) 赤经:3,421.44 mas/yr
赤纬:-1,599.27 mas/yr
视差 (π)130.288 ± 0.57 mas
距离25.0 ± 0.1 ly
(7.68 ± 0.03 pc)
绝对星等 (MV)5.78/11.6
轨道
伴星仙后座μB
绕行周期 (P)21.40 yr
半长轴 (a)0.189"
偏心率 (e)0.62
倾斜角 (i)110.0°
升交点黄经 (Ω)227.3°
近心点 历元 (T)1975.80
详细资料
质量0.60/0.17 M
半径0.74/0.29 R
亮度0.46/0.001 L
温度5290 K
金属量13-28%
自转?
年龄5.9 × 109 [1]
其他命名
30 Cassiopeiae, Gl 53, HR 321, BD+54°223, HD 6582, LHS 8, LTT 10460, GCTP 219.00, SAO 22024, FK5 1030, LFT 107, HIP 5336, GC 1360, CCDM J01080+5455
拜耳星表中的仙后座,圆圈中的就是阁道四(仙后座μ)。

阁道四 (仙后座μ)是在仙后座的一颗联星系统,并与仙后座θ共享英文名字 Marfak和中文的名称。

这个靠近的联星系统是在1961年被发现的,从那时候开始,这两颗恒星的轨道元素久已经很清楚的被了解,这两颗星的距离范围在0.54–2.30天文单位。与附近的恒星比较,这两颗星相对于银河系的速度较高,以167 km/s在星系中穿越。它们的金属量低。数于第二星族,被认为最先出现和形成的位置是在银河盘面上。

参考资料

  1. ^ Mamajek, Eric E.; Hillenbrand, Lynne A. Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics. The Astrophysical Journal. November 2008, 687 (2): 1264–1293. Bibcode:2008ApJ...687.1264M. doi:10.1086/591785. 

外部链接

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阁道四
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