半人馬座Xi2 (ξ2 Cen, ξ2 Centauri)是在南天人馬座的三星系統[12],這較寬的光學雙星視星等為裸眼可見的+4.30等[2],略比半人馬座ξ1A型主序星[13](+4.83等[14]),年週視差6.98mas,距離太陽大約470光年。在這樣的距離,恆星會因為中間的星際塵埃造成消光,而使視星等減弱0.32等[15]

半人馬座 ξ2
Centaurus constellation map.svg
半人馬座ξ2的位置
觀測資料
曆元 J2000.0
星座 半人馬座
星官
赤經 13h 06m 54.63940s[1]
赤緯 −49° 54′ 22.4823″[1]
視星等(V) 4.30[2] + 9.38[3]
特性
光谱分类B1.5 V[4] or B2 IV[5] + F7 V[3]
U−B 色指数−0.810[2]
B−V 色指数−0.197[2]
天体测定
徑向速度 (Rv)+14.3±4.1[6] km/s
自行 (μ) 赤经:−26.15[1] mas/yr
赤纬:−12.03[1] mas/yr
视差 (π)6.98 ± 0.24[1] mas
距离470 ± 20 ly
(143 ± 5 pc)
绝对星等 (MV)−1.51[7]
軌道[8]
繞行週期 (P)7.6497 d
偏心率 (e)0.35
近心点 曆元 (T)2418077.493 JD
近心點幅角 (ω)
(secondary)
308.6°
半振幅 (K1)
(primary)
38.8 km/s
詳細資料
ξ2 Cen A
質量8.1±0.1[4] M
表面重力 (log g)4.11±0.03[9]
亮度 (bolometric)1,702[9] L
溫度20,790±335[9] K
自轉速度 (v sin i)25[10] km/s
年齡11.5±3.7[4] Myr
ξ2 Cen B
質量1.25[9] M
亮度2.4[9] L
溫度6,194[9] K
其他命名
半人馬座ξ2CD−49° 7644、FK5 489、HD 113791、HIP 64004、HR 4942、SAO 223909[11]
參考資料庫
SIMBAD资料

參考 编辑

  1. ^ 1.0 1.1 1.2 1.3 1.4 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 , doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 2.2 2.3 Gutierrez-Moreno, Adelina; Moreno, Hugo, A photometric investigation of the Scorpio-Centaurus association, Astrophysical Journal Supplement, June 1968, 15: 459, Bibcode:1968ApJS...15..459G, doi:10.1086/190168. 
  3. ^ 3.0 3.1 3.2 Gahm, G. F.; et al, A study of visual double stars with early type primaries. I - Spectroscopic results, Astronomy and Astrophysics Supplement Series, January 1983, 51: 143–159, Bibcode:1983A&AS...51..143G. 
  4. ^ 4.0 4.1 4.2 4.3 4.4 Tetzlaff, N.; et al, A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun, Monthly Notices of the Royal Astronomical Society, January 2011, 410 (1): 190–200, Bibcode:2011MNRAS.410..190T, S2CID 118629873, arXiv:1007.4883 , doi:10.1111/j.1365-2966.2010.17434.x. 
  5. ^ 5.0 5.1 Hohle, M. M.; et al, Masses and luminosities of O- and B-type stars and red supergiants, Astronomische Nachrichten, April 2010, 331 (4): 349, Bibcode:2010AN....331..349H, S2CID 111387483, arXiv:1003.2335 , doi:10.1002/asna.200911355. 
  6. ^ 6.0 6.1 Bobylev, V. V.; Bajkova, A. T., Galactic kinematics from a sample of young massive stars, Astronomy Letters, August 2013, 39 (8): 532–549, Bibcode:2013AstL...39..532B, S2CID 118568203, arXiv:1307.1677 , doi:10.1134/S106377371308001X. 
  7. ^ Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, S2CID 119257644, arXiv:1108.4971 , doi:10.1134/S1063773712050015. 
  8. ^ 8.0 8.1 Pourbaix, D.; et al, SB9: The ninth catalogue of spectroscopic binary orbits, Astronomy & Astrophysics, 2004, 424 (2): 727–732, Bibcode:2004A&A...424..727P, S2CID 119387088, arXiv:astro-ph/0406573 , doi:10.1051/0004-6361:20041213. 
  9. ^ 9.00 9.01 9.02 9.03 9.04 9.05 9.06 9.07 9.08 9.09 Gerbaldi, M.; et al, Binary systems with post-T Tauri secondaries, Astronomy and Astrophysics, November 2001, 379: 162–184, Bibcode:2001A&A...379..162G, doi:10.1051/0004-6361:20011298 . 
  10. ^ Wolff, S. C.; et al, Rotational Velocities for B0-B3 Stars in Seven Young Clusters: Further Study of the Relationship between Rotation Speed and Density in Star-Forming Regions, The Astronomical Journal, 2007, 133 (3): 1092–1103, Bibcode:2007AJ....133.1092W, S2CID 119074863, arXiv:astro-ph/0702133 , doi:10.1086/511002. 
  11. ^ ksi02 Cen -- Spectroscopic binary, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2017-01-09], (原始内容存档于2022-10-31). 
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  13. ^ Backyard Astronomy, The Guides, Fog City Press: 248, 2003, ISBN 1877019321. 
  14. ^ Gutierrez-Moreno, Adelina; Moreno, Hugo, A photometric investigation of the Scorpio-Centaurus association, Astrophysical Journal Supplement, June 1968, 15: 459, Bibcode:1968ApJS...15..459G, doi:10.1086/190168. 
  15. ^ Gontcharov, G. A., Spatial distribution and kinematics of OB stars, Astronomy Letters, November 2012, 38 (11): 694–706, Bibcode:2012AstL...38..694G, S2CID 119108982, arXiv:1606.09028 , doi:10.1134/S1063773712110035. 
  16. ^ Moore, Joseph Haines, Ten stars having variable radial velocities, Lick Observatory Bulletin, 1910, 6 (182): 55–59, Bibcode:1910LicOB...6...55M, doi:10.5479/ADS/bib/1910LicOB.6.55M. 
  17. ^ Neubauer, F. J., The orbit of the spectroscopic binary ξ2 Centauri, Lick Observatory Bulletin, 1931, 15: 107–108, Bibcode:1931LicOB..15..107N, doi:10.5479/ADS/bib/1931LicOB.15.107N . 
  18. ^ Sharma, Awshesh N.; Bedding, Timothy R.; Saio, Hideyuki; White, Timothy R. Pulsating B stars in the Scorpius–Centaurus Association with TESS. Monthly Notices of the Royal Astronomical Society. 2022, 515: 828–840. Bibcode:2022MNRAS.515..828S. arXiv:2203.02582 . doi:10.1093/mnras/stac1816. 
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