十字架三(英语:Mimosa/mɪˈmsə/[8]β Cru / 南十字座β),是南十字座第二亮星,仅次于十字架二(南十字α);也是夜空第20亮星。它也是著名星群,称为南十字星的成员之一,但位于赤纬-60度的天空,所以只有在北回归线以南的地方才可以看到它。它距离地球约有280光年,是一颗联星,也可能是三合星系统。

十字架三A/B(Mimosa)
十字架三的位置(红圈)
观测资料
历元 J2000
星座 南十字座
星官 十字架近南极星区
赤经 12h 47m 43.26877s[1]
赤纬 –59° 41′ 19.5792″[1]
视星等(V) 1.25[2] (1.23 - 1.31[3])
特性
光谱分类B0.5 III[4] / B2V[5]
U−B 色指数–0.98[2]
B−V 色指数–0.23[2]
变星类型仙王座β[4]
天体测定
径向速度 (Rv)+15.6[6] km/s
自行 (μ) 赤经:–42.97[1] mas/yr
赤纬:–16.18[1] mas/yr
视差 (π)11.71 ± 0.98[1] mas
距离280 ± 20 ly
(85 ± 7 pc)
详细资料
A
质量16[4] M
半径8.4 ± 0.6[4] R
表面重力 (log g)3.6 ± 0.1[4]
亮度34,000[4] L
温度27,000 ± 1,000[4] K
金属量 [Fe/H]–0.08[7] dex
自转3.6 days[4]
自转速度 (v sin i)35[4] km/s
年龄8 to 11 million[4]
B
质量10[5] M
轨道[5]
主星β Crucis A
伴星十字架三B
绕行周期 (P)1828.0 ± 2.5 days
半长轴 (a)8.7 AU
偏心率 (e)0.38 ± 0.09
近心点 历元 (T)2449879 ± 38
近心点幅角 (ω)
(secondary)
293 ± 9°
其他命名
Mimosa,[8] Becrux,[9] β Crucis, HR 4853, CPD−59°4451, HD 111123, FK5 481, SAO 240259, HIP 62434
参考资料库
SIMBAD资料

名称

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参考资料

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  1. ^ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 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 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 
  3. ^ Samus, N. N.; Durlevich, O. V.; et al. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013). VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 2009, 1: 02025. Bibcode:2009yCat....102025S. 
  4. ^ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 Cohen, David H.; et al, Chandra spectroscopy of the hot star βCrucis and the discovery of a pre-main-sequence companion, Monthly Notices of the Royal Astronomical Society, June 2008, 386 (4): 1855–1871, Bibcode:2008MNRAS.386.1855C, S2CID 2924933, arXiv:0802.4084 , doi:10.1111/j.1365-2966.2008.13176.x 
  5. ^ 5.0 5.1 5.2 Aerts, C.; et al, Evidence for binarity and multiperiodicity in the beta Cephei star beta Crucis, Astronomy and Astrophysics, January 1998, 329: 137–146, Bibcode:1998A&A...329..137A 
  6. ^ Evans, D. S. Determination of Radial Velocities and their Applications. Batten, Alan Henry; Heard, John Frederick (编). Proceedings from IAU Symposium no. 30 30. University of Toronto: International Astronomical Union: 57. June 20–24, 1966. Bibcode:1967IAUS...30...57E.  |contribution=被忽略 (帮助)
  7. ^ Kilian, J., Chemical abundances in early B-type stars. 5: Metal abundances and LTE/NLTE comparison, Astronomy and Astrophysics, February 1994, 282 (3): 867–873, Bibcode:1994A&A...282..867K 
  8. ^ 8.0 8.1 IAU Catalog of Star Names. [2016-07-28]. (原始内容存档于2018-07-07). 
  9. ^ Hoffleit, Dorrit; Jaschek, Carlos. The Bright star catalogue. New Haven. 1991. Bibcode:1991bsc..book.....H. 

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