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軍井二

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軍井二(天兔座κ)
觀測資料
曆元 J2000.0
星座 天兔座
星官
赤經 05h 13m 13.87761s[1]
赤緯 −12° 56′ 28.6463″[1]
視星等(V) 4.43 + 7.00[2]
特性
光谱分类B9 V[3]
U−B 色指数−0.34[4]
B−V 色指数−0.10[4]
天体测定
徑向速度 (Rv)+20.8±1.0[5] km/s
自行 (μ) 赤经:−12.29[1] mas/yr
赤纬:−0.79[1] mas/yr
视差 (π)4.48 ± 0.58[1] mas
距离approx. 730 ly
(approx. 220 pc)
绝对星等 (MV)−2.34[6]
詳細資料 [3]
κ Lep A
質量4.86±0.39 M
半徑2.6[7] R
表面重力 (log g)3.44[8]
亮度1,346 L
溫度11,588 K
金属量 [Fe/H]−0.07[8] dex
自轉速度 (v sin i)135 km/s
其他命名
κ Lep、​4 Lep、​BD−13° 1092、​GC 6387、​HD 33949、​HIP 24327、​HR 1705、​SAO 150239、​CCDM J05132-1256AB[9]
參考資料庫
SIMBAD资料

軍井二(天兔座κ),來自拉丁化的名字是κ Leporis,是在南天星座天兔座的一個聯星系統[10]。這對恆星的視星等分別為4.43和7.00;前者的亮度足以用肉眼看到。截至2000年,它們的角距離為2.179弧秒位置角為357.3°。基於從地球量測的年週視差為4.48mas[1],這個系統距離太陽大約730光年。系統以20.8公里/秒的徑向速度遠離太陽[5]

系統中較亮的藍白色成員A,是B型主序星恆星分類為B9V[3]。它的質量幾乎是太陽質量的5倍[3],半徑是太陽半徑的2.6倍[7]。這顆恆星在11,588 K的有效溫度下,從其光球發出的輻射是太陽光度的1,346倍[3]。它在12μm的波長下顯示出紅外過量,使其成為星周岩屑盤的候選宿主[11]

參考資料

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  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 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. ^ Fabricius, C.; Makarov, V. V., Two-colour photometry for 9473 components of close Hipparcos double and multiple stars, Astronomy and Astrophysics, April 2000, 356: 141–145, Bibcode:2000A&A...356..141F. 
  3. ^ 3.0 3.1 3.2 3.3 3.4 Zorec, J.; Royer, F., Rotational velocities of A-type stars. IV. Evolution of rotational velocities, Astronomy & Astrophysics, January 2012, 537: A120, Bibcode:2012A&A...537A.120Z, S2CID 55586789, arXiv:1201.2052可免费查阅, doi:10.1051/0004-6361/201117691. 
  4. ^ 4.0 4.1 Johnson, H. L.; et al, UBVRIJKL photometry of the bright stars, Communications of the Lunar and Planetary Laboratory, 1966, 4 (99): 99, Bibcode:1966CoLPL...4...99J. 
  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. ^ Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, S2CID 119257644, arXiv:1108.4971可免费查阅, doi:10.1134/S1063773712050015. 
  7. ^ 7.0 7.1 Pasinetti Fracassini, L. E.; et al, Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS), Astronomy and Astrophysics Third, February 2001, 367: 521–24, Bibcode:2001A&A...367..521P, S2CID 425754, arXiv:astro-ph/0012289可免费查阅, doi:10.1051/0004-6361:20000451. 
  8. ^ 8.0 8.1 Saffe, C.; Gómez, M.; Pintado, O.; González, E., Spectroscopic metallicities of Vega-like stars, Astronomy and Astrophysics, October 2008, 490 (1): 297–305, Bibcode:2008A&A...490..297S, S2CID 15059920, arXiv:0805.3936可免费查阅, doi:10.1051/0004-6361:200810260. 
  9. ^ kap Lep. SIMBAD. 斯特拉斯堡天文資料中心. [2017-08-18]. 
  10. ^ Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, S2CID 14878976, arXiv:0806.2878可免费查阅, doi:10.1111/j.1365-2966.2008.13596.x. 
  11. ^ Mannings, Vincent; et al, Candidate Main-Sequence Stars with Debris Disks: A New Sample of Vega-like Sources, The Astrophysical Journal, 1998, 497 (1): 330–341, Bibcode:1998ApJ...497..330M, CiteSeerX 10.1.1.502.7594可免费查阅, S2CID 122421281, doi:10.1086/305432.