海山增二

海山增二
Diagram showing star positions and boundaries of the Vela constellation and its surroundings
船帆座μ的位置 (红圈处)
觀測資料
曆元 J2000.0
星座 船帆座[1][2]
星官 近南极星区 海山
赤經 10h 46m 46.2s[1][2]
赤緯 -49° 25′ 13″[1][2]
視星等（V） 2.69[1][2] (2.73 + 6.4)
特性
光谱分类G5III+F[1][2]
U−B 色指数0.57[1][2]
B−V 色指数0.9[1][2]
R−I 色指数0.49[1][2]
天体测定
徑向速度 (Rv)+6.2 km/s
自行 (μ) 赤经：+63.22 mas/yr
赤纬：–54.21> mas/yr
视差 (π)27.84 ± 0.38 mas
距离117 ± 2 ly
(35.9 ± 0.5 pc)
軌道
繞行週期 (P)138 yr
半長軸 (a)1.427"
偏心率 (e)0.84
倾斜角 (i)57.0°
升交点黃經 (Ω)59.1°
近心点 曆元 (T)1951.1
近心點幅角 (ω)
(secondary)		178.0°
詳細資料
μ Vel A
質量2.7 M☉
半徑13.5 R☉
亮度107 L☉
溫度5,047 K
自轉速度 (v sin i)6.4 km/s
年齡360 Myr
其他命名
CD-48 5913，SAO 222321，HD 93497，HR 4216
參考資料庫
SIMBAD资料

海山增二（μ Vel / 船帆座μ）是南天星座船帆座的一个双星系统。两星以半长轴1.437角秒，轨道周期116.24年相互绕行。该双星合并视星等2.69，肉眼可以轻易看见。根据视差测量，估计这个系统的距离是117光年。该系统年龄大约3.6亿年。

主星是恒星分类G5III的巨星，视星等2.73。它有107倍太阳光度，13.5太阳半径，2.7太阳质量。在1998年，极紫外探测器观测到很强的闪焰释放出将近等于整个恒星输出的X射线。

较暗的伴星，船帆座μB，是一个恒星分类G2V的主序星，视星等6.0。然而这个分类存在疑问，进一步的分析显示该星可能实际上是F4V或F5V的分类，质量大约是太阳1.3倍。这种恒星通常不会有很明显的磁场活动。

参考文献

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Pulsating variable Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2012-07-13]. 
  2. ^ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 VizieR Detailed Page. [2012-07-13]. （原始内容存档于2016-03-05）. 


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