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右旗三

天鹰座δ
Diagram showing star positions and boundaries of the Aquila constellation and its surroundings
天鹰座
观测资料
历元 J2000
星座 天鹰座
星官 右旗 (星官)牛宿
赤经 19h 25m 29.90139s
赤纬 +03° 06′ 53.2061″
视星等(V) 3.365
特性
光谱分类F0IV+K4V
U−B 色指数0.04
B−V 色指数0.32
R−I 色指数0.16
变星类型盾牌座δ变星
天体测定
径向速度 (Rv)–30.1 km/s
自行 (μ) 赤经:+254.54 mas/yr
赤纬:+82.51 mas/yr
视差 (π)64 ± 1.00 mas
距离51.0 ± 0.8 ly
(15.6 ± 0.2 pc)
绝对星等 (MV)2.37
轨道
绕行周期 (P)3.426 ± 0.006 yr
半长轴 (a)0.0539 ± 0.0040"
偏心率 (e)0.36 ± 0.07
倾斜角 (i)150 ± 11°
升交点黄经 (Ω)337 ± 9°
近心点 历元 (T)1954.58 ± 0.13
近心点幅角 (ω)
(secondary)
191 ± 14°
详细资料
δ Aql A
质量1.8 M
半径1.8 R
表面重力 (log g)4.03
亮度9.6 L
温度7,016 K
金属量 [Fe/H]–0.04 dex
自转速度 (v sin i)87.3 km/s
δ Aql B
质量0.67 M
半径0.67 R
其他命名
BD+02 3879,SAO 124603,HD 182640,HR 7377
参考数据库
SIMBAD资料

天鹰座Delta(天鹰座δ,δ Aql) 是一个在赤道星座天鹰座双星系统。中文星官名右旗三视星等3.36,视差测量显示它距离地球大约51光年

物理特性

[编辑]

右旗三是一个天测联星,两个成员以3.422年互绕,轨道离心率大约0.36。这种双星是经由伴星对主星的引力摄动发现的。个别的成员没有被望远镜分离。

主星天鹰座δA是一个恒星分类F0IV的次巨星,光度分类IV代表它已经逐渐耗尽核心的氢,正在朝向巨星演化。该星质量比太阳大80%,已经膨胀成1.8太阳半径。它辐射出9-10太阳光度,表面温度7,016K使它成为一个发出黄白色光的F型星。天鹰座δA是盾牌座δ变星,由外层大气的脉动产生的光度变化。该星以87km/s的速度高速旋转。

伴星天鹰座δB,是一个较小的恒星有67%太阳质量,半径。可能是一个橙矮星

参考文献

[编辑]
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右旗三
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