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小熊座π1

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小熊座π1
观测数据
历元 J2000.0      分点 J2000.0 (ICRS)
星座 小熊座
小熊座 π1 A
赤经 15h 29m 11.18599s[1]
赤纬 +80° 26′ 54.9713″[1]
视星等 (V) +6.58[2]
小熊座π1 B
赤经 15h 29m 23.59426s[1]
赤纬 +80° 27′ 00.9675″[1]
视星等 (V) +7.31[2]
特性
光谱分类G1.5 V(n)[3] + G9 V[4]
U−B 色指数+0.13[2] + +0.37[2]
B−V 色指数+0.67[2] + +0.79[2]
天体测定
小熊座π1 A
径向速度 (Rv)−16.27±0.09[5] km/s
自行 (μ) 赤经：−225.109[6] mas/yr
赤纬：+107.575[6] mas/yr
视差 (π)45.8577 ± 0.0328[6] mas
距离71.12 ± 0.05 ly
(21.81 ± 0.02 pc)
绝对星等 (MV)4.94±0.04[7]
π1 UMi B
径向速度 (Rv)−15.40±0.70[5] km/s
自行 (μ) 赤经：−217.817[8] mas/yr
赤纬：+105.947[8] mas/yr
视差 (π)45.8038 ± 0.0352[8] mas
距离71.21 ± 0.05 ly
(21.83 ± 0.02 pc)
详细资料
小熊座π1 A
质量1.02[9] M☉
半径0.98[6] R☉
表面重力 (log g)4.40[10]
亮度0.929[6] L☉
温度5,771[10] K
金属量 [Fe/H]−0.22[11] dex
年龄9.22±3.84[12] Gyr
π1 UMi B
质量0.92[9] M☉
半径0.84[8] R☉
表面重力 (log g)4.50[10]
亮度0.520[8] L☉
温度5,408[10] K
其他命名
π1 UMi、​ADS 9696、​WDS J15292+8027[13]
参考资料库
SIMBADπ1 UMi AB
π1 UMi A
π1 UMi B

小熊座π1[14]是在拱极星座小熊座北部的共同自行联星[15]。该对的视星等分别为+6.58和+7.31，综合星等为+6.1[2]。它们位于距离太阳约71光年的地方。两星的角距离为31.4弧秒[15]，其对应于实际约680AU[16]，并以大约13,100年的周期互绕著彼此运行[9]。

这两颗恒星都是类太阳恒星，并已被列为天琴-武仙星协的可能成员，该星协是距离太阳最近的移动星群之一[16]，然而现在认为这不太可能[17]。 主星小熊座π1 A，质量比太阳高2%，表面有效温度为5,771 K，半径为太阳的的98%和辐射热光度为太阳的93%。伴星，小熊座π1 B，质量是太阳的92%，温度略低为5,408 K，半径是太阳的 84%，光度略高于太阳的一半。

参考资料

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  1. ^ 1.0 1.1 1.2 1.3 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, S2CID 18759600, arXiv:0708.1752 可免费查阅, doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Johnson, Harold L., Photoelectric Observations of Visual Double Stars., Astrophysical Journal, May 1953, 117: 361, Bibcode:1953ApJ...117..361J, doi:10.1086/145700. 
  3. ^ Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, S2CID 119476992, arXiv:astro-ph/0603770 可免费查阅, doi:10.1086/504637. 
  4. ^ Abt, H. A., Visual multiples. VII - MK classifications, The Astrophysical Journal Supplement Series, 1981, 45: 437, Bibcode:1981ApJS...45..437A, doi:10.1086/190719. 
  5. ^ 5.0 5.1 de Bruijne, J. H. J.; Eilers, A.-C., Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, S2CID 59451347, arXiv:1208.3048 可免费查阅, doi:10.1051/0004-6361/201219219, A61. 
  6. ^ 6.0 6.1 6.2 6.3 6.4 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 可免费查阅. doi:10.1051/0004-6361/201833051.  VizieR中此天体在盖亚望远镜第二批数据发布的记录
  7. ^ Porto de Mello, G. F.; et al, A photometric and spectroscopic survey of solar twin stars within 50 parsecs of the Sun; I. Atmospheric parameters and color similarity to the Sun, Astronomy and Astrophysics, March 2014, 563: A52, Bibcode:2014A&A...563A..52P, S2CID 119111150, arXiv:1312.7571 可免费查阅, doi:10.1051/0004-6361/201322277. 
  8. ^ 8.0 8.1 8.2 8.3 8.4 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 可免费查阅. doi:10.1051/0004-6361/201833051.  VizieR中此天体在盖亚望远镜第二批数据发布的记录
  9. ^ 9.0 9.1 9.2 Tokovinin, Andrei, From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs, The Astronomical Journal, 2014, 147 (4): 14, Bibcode:2014AJ....147...87T, S2CID 56066740, arXiv:1401.6827 可免费查阅, doi:10.1088/0004-6256/147/4/87, 87. 
  10. ^ 10.0 10.1 10.2 10.3 Mishenina, T. V.; et al, Abundances of neutron-capture elements in stars of the Galactic disk substructures, Astronomy & Astrophysics, April 2013, 552: 12, Bibcode:2013A&A...552A.128M, S2CID 119268097, arXiv:1303.1730 可免费查阅, doi:10.1051/0004-6361/201220687, A128. 
  11. ^ Casagrande, L.; et al, New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey, Astronomy & Astrophysics, 2011, 530 (A138): 21, Bibcode:2011A&A...530A.138C, S2CID 56118016, arXiv:1103.4651 可免费查阅, doi:10.1051/0004-6361/201016276. 
  12. ^ Pace, G., Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram, Astronomy & Astrophysics, March 2013, 551: 4, Bibcode:2013A&A...551L...8P, S2CID 56420519, arXiv:1301.5651 可免费查阅, doi:10.1051/0004-6361/201220364, L8. 
  13. ^ ** STF 1972AB. SIMBAD. 斯特拉斯堡天文资料中心. [2017-06-26]. 
  14. ^ Kepple, George Robert; Sanner, Glen W., The Night Sky Observers Guide: Spring & summer 2, Willmann-Bell: 418, 1998, ISBN 0943396603. 
  15. ^ 15.0 15.1 Lépine, Sébastien; Bongiorno, Bethany, New Distant Companions to Known Nearby Stars. II. Faint Companions of Hipparcos Stars and the Frequency of Wide Binary Systems, The Astronomical Journal, March 2007, 133 (3): 889–905, Bibcode:2007AJ....133..889L, S2CID 16800796, arXiv:astro-ph/0610605 可免费查阅, doi:10.1086/510333. 
  16. ^ 16.0 16.1 Eisenbeiss, T.; et al, The Hercules-Lyra association revisited. New age estimation and multiplicity study (PDF), Astronomy & Astrophysics, August 2013, 556: 19, Bibcode:2013A&A...556A..53E, S2CID 119275785, arXiv:1312.4045 可免费查阅, doi:10.1051/0004-6361/201118362, A53. [永久失效链接]
  17. ^ Lopez-Santiago, J.; Montes, D.; Crespo-Chacon, I.; Fernandez-Figueroa, M. J., The Nearest Young Moving Groups, The Astrophysical Journal, 2006, 643 (2): 1160–1165, Bibcode:2006ApJ...643.1160L, S2CID 119520529, arXiv:astro-ph/0601573 可免费查阅, doi:10.1086/503183. 

外部链接

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检索自“https://zh.wikipedia.org/w/index.php?title=HD_139777&oldid=83166572”