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金鱼增一

金鱼增一 (绘架座α)
红点显示金鱼增一(绘架座α)的位置。
观测资料
历元 J2000
星座 绘架座
星官 金鱼 (近南极星)
赤经 06h 48m 11.4523s[1]
赤纬 −61° 56′ 29.010″[1]
视星等(V) 3.30
特性
光谱分类A7IV[2]
U−B 色指数+0.13[3]
B−V 色指数+0.21[3]
天体测定
径向速度 (Rv)+20.6[4] km/s
自行 (μ) 赤经:-68.39[1] mas/yr
赤纬:242.03[1] mas/yr
视差 (π)32.96 ± 2.14[1] mas
距离99 ± 6 ly
(30 ± 2 pc)
详细资料
半径1.6[5] R
表面重力 (log g)3.48[6]
温度7,530[6] K
自转速度 (v sin i)206[7] km/s
年龄6.6 × 108[8][9]
其他命名
Gl 248, CD-61°1478, HR 2550, HD 50241, LTT 2656, SAO 249647, IRAS 06476-6153, HIP 32607.[10]

金鱼增一(绘架座α) (α Pic / α Pictoris)是绘架座最亮的恒星视星等3.30,距离太阳99光年 [1]。这是一颗比较年轻的牧夫座λ型星 [11],估计年龄为6亿6千万岁[8][9],并且以高速自转,估计恒星自转的速率可能高于206公里/秒[7]

光谱的吸收谱现呈现狭窄且随时间变化的现象,显示出星周盘气体朝向恒星的特征。这不是星际物质造成的结果,但可能取代的是沿着轨道平面的气体壳。金鱼增一被归类为快速旋转的壳层星,可能在近期内会将大气层的质量抛射出来[2][6]

来自依巴谷任务的资料显示,这可能是一颗尚待确认的联星,有一颗轨道半长轴为1天文单位的伴星,或是与太阳到地球相等的距离[11]。金鱼增一也是一个X射线源,由于模型预测这颗恒星没有磁发电机,因此它是一颗不寻常的A型恒星。这些辐射可能来自他的伴星[6][12]

这颗恒星的空间速度分量是U = -22,V = -20和W = -9 公里/秒[13]

水星而言,金鱼增一是他的南极星[14]

参考资料

[编辑]
  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 Perryman, M. A. C.; et al. The HIPPARCOS Catalogue. Astronomy & Astrophysics. April 1997, 323: L49–L52. Bibcode:1997A&A...323L..49P. 
  2. ^ 2.0 2.1 Roberge, Aki; Weinberger, Alycia J. Debris Disks around Nearby Stars with Circumstellar Gas. The Astrophysical Journal. March 2008, 676 (1): 509–517 [2010-08-10]. doi:10.1086/527314. (原始内容存档于2019-07-01). 
  3. ^ 3.0 3.1 Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. UBVRIJKL photometry of the bright stars.. Communications of the Lunar & Planetary Laboratory. 1966, 4: 99–110. Bibcode:1966CoLPL...4...99J. 
  4. ^ Wilson, R. E. General Catalogue of Stellar Radial. Washington D.C.: Carnegie Institude Publication 601. 1953 [2009-09-10]. (原始内容存档于2011-06-04). 
  5. ^ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics. Astronomy and Astrophysics. February 2001, 367: 521–524. doi:10.1051/0004-6361:20000451. 
  6. ^ 6.0 6.1 6.2 6.3 Hempel, M.; Schmitt, J. H. M. M. High resolution spectroscopy of circumstellar material around A stars. Astronomy and Astrophysics. 2003, 408: 971–979. doi:10.1051/0004-6361:20030946. 
  7. ^ 7.0 7.1 Royer, F.; Zorec, J.; Gómez, A. E. Rotational velocities of A-type stars. III. Velocity distributions. Astronomy and Astrophysics. February 2007, 463 (2): 671–682. doi:10.1051/0004-6361:20065224. 
  8. ^ 8.0 8.1 Su, K. Y. L.; et al. Debris Disk Evolution around A Stars. The Astrophysical Journal. December 2006, 653 (1): 675–689. doi:10.1086/508649. 
  9. ^ 9.0 9.1 Song, Inseok; Caillault, J.-P.; Barrado y Navascués, David; Stauffer, John R. Ages of A-Type Vega-like Stars from uvbyβ Photometry. The Astrophysical Journal. January 2001, 546 (1): 352–357. doi:10.1086/318269. 
  10. ^ LTT 2656 – High proper-motion Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2009-09-10]. (原始内容存档于2014-12-23). 
  11. ^ 11.0 11.1 Goldin, A.; Makarov, V. V. Astrometric Orbits for Hipparcos Stochastic Binaries. The Astrophysical Journal Supplement Series. November 2007, 173 (1): 137–142. doi:10.1086/520513. 
  12. ^ Schröder, C.; Schmitt, J. H. M. M. X-ray emission from A-type stars. Astronomy and Astrophysics. November 2007, 475 (2): 677–684. doi:10.1051/0004-6361:20077429. 
  13. ^ Gliese, W. Catalogue of Nearby Stars. Veröffentlichungen des Astronomischen Rechen-Instituts Heidelberg. 1969. Bibcode:1969VeARI..22....1G. 
  14. ^ Moore, Patrick, Moore on Mercury: the planet and the missions, Springer: 121, 2007, ISBN 1846282578 
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金鱼增一
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