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格利泽3991

Gliese 3991
观测数据
历元 J2000.0      分点 2015.5
星座 武仙座
GJ 3991 A
赤经 17h 09m 32.018s[1]
赤纬 +43° 40′ 48.52″
视星等 (V) 13.671
GJ 3991 B
赤经 17h 09m 32.018s
赤纬 +43° 40′ 48.52″
视星等 (V) >15
特性
光谱分类M3.5V
视星等 (B)13.46
视星等 (R)11.511
视星等 (J)7.380
视星等 (H)6.76
视星等 (K)6.485
天体测定
径向速度 (Rv)−9.7±0.2 km/s
自行 (μ) 赤经:332.59±1.01[1] mas/yr
赤纬:−271.83±1.11 mas/yr
视差 (π)131.5996 ± 0.4285[2] mas
距离24.78 ± 0.08 ly
(7.60 ± 0.02 pc)
绝对星等 (MV)14.316
轨道[3]
主星GJ 3991 B
伴星GJ 3991 A
绕行周期 (P)14.7136±0.0005 days
(0.0402836±0.0000014 )
半长轴 (a)0.015+0.01
−0.05
"
(0.1102 AU)
偏心率 (e)0.068±0.004
近心点幅角 (ω)
(primary)
175.0±3.0°
半振幅 (K1)
(primary)
50.6±0.2 km/s
详细资料
GJ 3991 A
质量0.20 M
温度3250±50 K
金属量1.584+0.235
−0.205
Fe/
金属量 [Fe/H]0.20±0.06 dex
GJ 3991 B
质量0.50 M
温度~4900 K
年龄>6? Gyr
其他命名
G 203-47, Gliese 3991, HIP 83945, USNO 752
参考数据库
SIMBAD资料

格利泽3991 (又称 Gliese 3991G 203-47) 是位于武仙座的一个双星系统,距离太阳系约24.7光年。系统中包括一颗质量为20-30%太阳质量红矮星和约50%太阳质量白矮星。两颗恒星在0.11天文单位的紧密轨道上相互绕行,轨道周期仅有14.71天。由于它们之间的距离很小,这两个物体从未在视觉上被分辨出来,而只是根据格利泽3991 A的径向速度变化来预测,使该系统成为光谱联星

白矮星

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格利泽3991 B是第9个最近的白矮星,仅次于天狼星B南河三B范马南星GJ 440波江座40B、施泰因2051B、G 240-72LP 658-2。 其中,格利泽3991 B不仅是最冷的,而且是唯一一颗与另一颗恒星处于短周期轨道上的。格利泽3991 B的年龄可能超过60亿年,也是这些天体中最古老的。[4]

参见

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参考资料

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  1. ^ 1.0 1.1 Lindegren, L.; et al. Gaia Data Release 2: The astrometric solution. Astronomy & Astrophysics. 25 April 2018, A2: 616. Bibcode:2018A&A...616A...2L. S2CID 54497421. arXiv:1804.09366可免费查阅. doi:10.1051/0004-6361/201832727. 
  2. ^ Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533可免费查阅. doi:10.1051/0004-6361/202039657可免费查阅.  已忽略未知参数|collaboration= (帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  3. ^ Delfosse, Xavier; et al, New neighbours. I. 13 new companions to nearby M dwarfs, Astronomy and Astrophysics, April 1999, 344: 897–910, Bibcode:1999A&A...344..897D, arXiv:astro-ph/9812008可免费查阅. 
  4. ^ Bergeron, Pierre. Synthetic Colors and Evolutionary Sequences of Hydrogen- and Helium-Atmosphere White Dwarfs. [22 June 2018]. (原始内容存档于2023-03-24). 
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格利泽3991
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