右旗五天鹰座ιIota Aquilae),拜耳命名法依据拉丁文ι Aquilae命名这颗在天球赤道星座天鹰座恒星天鹰座ι佛氏命名法则为天鹰座41。它的传统名称是与天弁七(天鹰座λ)共用的Al Thalimain。这源自阿拉伯文الظليمان ath-thalīmain ,意思是"两只鸵鸟"[来源请求],它的视星等为4.364[2],明亮到可以用裸眼直接看见。依据年周视差 8.34 ± 0.79 mas[1],它与地球的距离大约是390光年(120秒差距)。在这个距离上,星际气体和尘埃造成的消光估计是0.15星等[6]

右旗五(天鹰座ι)
Diagram showing star positions and boundaries of the Aquila constellation and its surroundings
右旗五(天鹰座ι)的位置(圆圈)
观测资料
历元 J2000
星座 天鹰座
星官 右旗牛宿
赤经 19h 36m 43.27606s[1]
赤纬 –01° 17′ 11.7611″[1]
视星等(V) 4.364[2]
特性
光谱分类B5 III[3]
U−B 色指数–0.428[2]
B−V 色指数–0.083[2]
R−I 色指数–0.08
天体测定
径向速度 (Rv)–21.4[4] km/s
自行 (μ) 赤经:–0.87[1] mas/yr
赤纬:–20.39[1] mas/yr
视差 (π)8.34 ± 0.79[1] mas
距离390 ± 40 ly
(120 ± 10 pc)
绝对星等 (MV)−1.01[5]
详细资料
质量4.8 ± 0.3[6] M
半径5.5 ± 0.5[6] R
表面重力 (log g)3.64 ± 0.05[6]
亮度851[6] L
温度14,552[7] K
金属量 [Fe/H]0.09±0.04[5] dex
自转速度 (v sin i)55[8] km/s
年龄100 ± 8[6] Myr
其他命名
Al Thalimain、ι Aql、41 Aql, BD-01° 3782、 HD 184930、HIP 96468、HR 7447、SAO 143597.[9]
参考资料库
SIMBAD资料

名称

中文右旗Yòu Qí),意思是牛宿右边的旗帜。右旗原本由天鹰座μ天鹰座σ天鹰座δ天鹰座ν、天鹰座ι、HD 184701天鹰座42天鹰座κ天鹰座56共九星组成[10]。天鹰座ι为右旗五,是星官右旗的第五颗星[11]

性质

虽然右旗五在恒星目录上被列为巨星,但经过尺度的计算显示,它实际上是颗主序星[12]。它的质量大约是太阳的五倍,半径约是太阳的五至六倍[6]。它是颗蓝白色调的B型恒星,从表面有效温度14,552K的外大气层[7]辐射的光度是太阳的851倍。这颗恒星的投影转速是每秒55公里[8],尽管他的年龄大约只有一亿岁,但它已经渡过主序带上生命期的91% [6]

参考资料

  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, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 2.2 2.3 Kozok, J. R., Photometric observations of emission B-stars in the southern Milky Way, Astronomy and Astrophysics Supplement Series, September 1985, 61: 387–405, Bibcode:1985A&AS...61..387K. 
  3. ^ Lesh, Janet Rountree, The Kinematics of the Gould Belt: an Expanding Group?, Astrophysical Journal Supplement, December 1968, 17: 371, Bibcode:1968ApJS...17..371L, doi:10.1086/190179. 
  4. ^ Evans, D. S., Batten, Alan Henry; Heard, John Frederick , 编, The Revision of the General Catalogue of Radial Velocities, in Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, Determination of Radial Velocities and their Applications (University of Toronto: International Astronomical Union), June 20–24, 1966, 30: 57–63 (1967), Bibcode:1967IAUS...30...57E. 
  5. ^ 5.0 5.1 Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971 , doi:10.1134/S1063773712050015. 
  6. ^ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Lyubimkov, Leonid S.; et al, Surface abundances of light elements for a large sample of early B-type stars - II. Basic parameters of 107 stars, Monthly Notices of the Royal Astronomical Society, June 2002, 333 (1): 9–26, Bibcode:2002MNRAS.333....9L, doi:10.1046/j.1365-8711.2002.05341.x 
  7. ^ 7.0 7.1 Underhill, A. B.; et al, Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars, Monthly Notices of the Royal Astronomical Society, November 1979, 189 (3): 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601. 
  8. ^ 8.0 8.1 Abt, Helmut A.; Levato, Hugo; Grosso, Monica, Rotational Velocities of B Stars, The Astrophysical Journal, July 2002, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590. 
  9. ^ iot Aql -- Star in double system, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-07-18], (原始内容存档于2020-11-05). 
  10. ^ (中文) 中国星座神话, written by 陈久金. Published by 台湾书房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  11. ^ (中文) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育资讯网 2006 年 7 月 3 日页面存档备份,存于互联网档案馆
  12. ^ Kaler, James B., Al Thalimain (Iota Aquilae), university of Illinois, [2012-07-18], (原始内容存档于2012-02-17) 

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