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河鼓三

河鼓三(天鹰座γ)
此图显示天鹰座的星星分布位置及它的范围边界
红圈处为河鼓三的位置
河鼓三的位置 (红圈)
观测资料
历元 J2000
星座 天鹰座
星官 河鼓
赤经 19h 46m 15.58029s[1]
赤纬 +10° 36′ 47.7408″[1]
视星等(V) 2.712[2]
特性
光谱分类K3 II[3]
U−B 色指数+1.720[2]
B−V 色指数+1.500[2]
天体测定
径向速度 (Rv)-2.79[4] km/s
自行 (μ) 赤经:+16.99[1] mas/yr
赤纬:-2.98[1] mas/yr
视差 (π)8.26 ± 0.17[1] mas
距离395 ± 8 ly
(121 ± 2 pc)
绝对星等 (MV)−3.38+0.24
−0.22
[5]
详细资料
质量5.66±0.66[6] M
半径95[7] R
表面重力 (log g)1.63[8]
亮度2538[6] L
温度4210[8] K
金属量 [Fe/H]–0.29[8] dex
自转速度 (v sin i)8[9] km/s
其他命名
Tarazed、Reda、50 Aql、 gam Aql、 BD+10 4043, FK5 741, HD186791、 HIP 97278, HR7525、SAO105223.[10]
参考数据库
SIMBAD资料


河鼓三γ Aql/天鹰座γ),英文名Tarazed[11],是位于天鹰座的一颗恒星。它的视星等2.712 [2],使它以裸眼都很容易看见。 视差测量得到它与太阳的距离大约是395光年(121秒差距[1]

物理性质

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河鼓三相对于牛郎星(河鼓二,在中心)的位置。

河鼓三的年龄大约只有一亿岁,是一颗相对年轻的恒星。然而,它在恒星演化的路途上已经消耗掉核心的氢,进入亮巨星的阶段,在恒星分类上是K3II[3]。这颗恒星正在核心将燃烧为。当河鼓三耗尽核聚变的燃料之后,它将成为白矮星[12]

利用干涉测量河鼓三的角直径为7.271±0.073毫角秒[13],依估计的距离推算,它的半径相当于太阳半径的95倍[7],质量是太阳质量的6倍,是一颗巨大的恒星,而辐射的亮度超过太阳的2500[6]。表面的有效温度4210 K,使它呈现典型K型恒星的橙色[8][14]

名称

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河鼓三,以拜耳命名法命名的拉丁文的名称是天鹰座γ。

它的传统名称是Tarazed[12],这是源自波斯文的شاهين ترازو šāhin tarāzu,意思是“杆的尺度”,指的是星座间的尺度:河鼓一(天鹰座β)、河鼓二(天鹰座α,牛郎星)和河鼓三(波斯文的šāhīn意思是“皇家猎鹰”的“杆”和“指标”,河鼓一就是“猎鹰”。)。在2016年,国际天文学联合会IAU恒星名称工作组(WGSN) [15]标准化恒星的名称和目录。 WGSN在2016年8月21日核定了这颗恒星的名字为"Tarazed",并收录进国际天文学联合会的恒星名称目录[11]

在《Calendarium of Al Achsasi Al Mouakket》的恒星目录中,这颗星的名称是"Menkib Al Nesr"("منكبألنسر"-"mankib"),翻译成拉丁文是老鹰的肱骨,意思就是“老鹰的肩膀”[16]

中国河鼓Hé Gŭ),是一个星官,意思是河边的鼓,主要的成员还有河鼓一(天鹰座β)和河鼓二(天鹰座α,牛郎星)[17]。天鹰座γ就是河鼓三Hé Gŭ sān,英语:河鼓的第三顆星。)[18]。在中国神话中,这颗星和河鼓一是玉皇大帝的女儿织女织女星)和牛郎(牛郎星)的两个孩子。

澳大利亚的桑折人(The Koori people)称河鼓一和河鼓三是黑天鹅 Bunjil楔尾雕,河鼓二)的妻子[19]

参考资料

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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, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752可免费查阅, doi:10.1051/0004-6361:20078357 
  2. ^ 2.0 2.1 2.2 2.3 Cousins, A. W. J., Standardization of Broadband Photometry of Equatorial Standards, South African Astronomical Observatory Circulars, 1984, 8: 59, Bibcode:1984SAAOC...8...59C 
  3. ^ 3.0 3.1 Morgan, W. W.; Keenan, P. C., Spectral Classification, Annual Review of Astronomy and Astrophysics, 1973, 11 (1): 29, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333 
  4. ^ Famaey, B.; et al, Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters, Astronomy and Astrophysics, January 2005, 430 (1): 165–186, Bibcode:2005A&A...430..165F, arXiv:astro-ph/0409579可免费查阅, doi:10.1051/0004-6361:20041272 
  5. ^ Carney, Bruce W.; et al, Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars, The Astronomical Journal, March 2008, 135 (3): 892–906, Bibcode:2008AJ....135..892C, arXiv:0711.4984可免费查阅, doi:10.1088/0004-6256/135/3/892 
  6. ^ 6.0 6.1 6.2 Hohle, M. M.; Neuhäuser, R.; Schutz, B. F., Masses and luminosities of O- and B-type stars and red supergiants, Astronomische Nachrichten, April 2010, 331 (4): 349, Bibcode:2010AN....331..349H, arXiv:1003.2335可免费查阅, doi:10.1002/asna.200911355 
  7. ^ 7.0 7.1 Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library 1 3, Birkhäuser, 2006 [2018-07-02], ISBN 3-540-29692-1, (原始内容存档于2019-05-20) . The radius (R*) is given by:
  8. ^ 8.0 8.1 8.2 8.3 McWilliam, Andrew, High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances, Astrophysical Journal Supplement Series, December 1990, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527 
  9. ^ Bernacca, P. L.; Perinotto, M., A catalogue of stellar rotational velocities, Contributi Osservatorio Astronomico di Padova in Asiago, 1970, 239 (1), Bibcode:1970CoAsi.239....1B 
  10. ^ TARAZED -- Star in double system, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-01-09], (原始内容存档于2020-11-05) 
  11. ^ 11.0 11.1 IAU Catalog of Star Names. [28 July 2016]. (原始内容存档于2018-07-07). 
  12. ^ 12.0 12.1 Kaler, James B., TARAZED (Gamma Aquilae), Stars (University of Illinois), [2012-01-10], (原始内容存档于2020-10-03) 
  13. ^ Mozurkewich, D.; et al, Angular Diameters of Stars from the Mark III Optical Interferometer, The Astronomical Journal, November 2003, 126 (5): 2502–2520, Bibcode:2003AJ....126.2502M, doi:10.1086/378596 
  14. ^ The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], (原始内容存档于2012-03-10) 
  15. ^ IAU Working Group on Star Names (WGSN), International Astronomical Union, [22 May 2016], (原始内容存档于2019-03-30). 
  16. ^ Knobel, E. B. Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket. Monthly Notices of the Royal Astronomical Society. June 1895, 55: 429. Bibcode:1895MNRAS..55..429K. doi:10.1093/mnras/55.8.429. 
  17. ^ (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.
  18. ^ (中文) 香港太空馆 - 研究资源 - 亮星中英对照表 互联网档案馆存档,存档日期August 19, 2010,., Hong Kong Space Museum. Accessed on line November 23, 2010.
  19. ^ Mudrooroo. Aboriginal mythology : an A-Z spanning the history of aboriginal mythology from the earliest legends to the present day. London: HarperCollins. 1994: 4. ISBN 1-85538-306-3. 

外部链接

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河鼓三
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