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金魚增一

金魚增一 (繪架座α)
紅點顯示金魚增一(繪架座α)的位置。
觀測資料
曆元 J2000
星座 繪架座
星官 金魚 (近南極星)
赤經 06h 48m 11.4523s[1]
赤緯 −61° 56′ 29.010″[1]
視星等(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
徑向速度 (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)
詳細資料
半徑1.6[5] R
表面重力 (log g)3.48[6]
溫度7,530[6] K
自轉速度 (v sin i)206[7] km/s
年齡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]

金魚增一(繪架座α) (α Pic / α Pictoris)是繪架座最亮的恆星視星等3.30,距離太陽99光年 [1]。這是一顆比較年輕的牧夫座λ型星 [11],估計年齡為6億6千萬歲[8][9],並且以高速自轉,估計恆星自轉的速率可能高於206公里/秒[7]

光譜的吸收譜現呈現狹窄且隨時間變化的現象,顯示出星周盤氣體朝向恆星的特徵。這不是星際物質造成的結果,但可能取代的是沿著軌道平面的氣體殼。金魚增一被歸類為快速旋轉的殼層星,可能在近期內會將大氣層的質量拋射出來[2][6]

來自依巴谷任務的資料顯示,這可能是一顆尚待確認的聯星,有一顆軌道半長軸為1天文單位的伴星,或是與太陽到地球相等的距離[11]。金魚增一也是一個X射線源,由於模型預測這顆恆星沒有磁發電機,因此它是一顆不尋常的A型恆星。這些輻射可能來自他的伴星[6][12]

這顆恆星的空間速度分量是U = -22,V = -20和W = -9 公里/秒[13]

水星而言,金魚增一是他的南極星[14]

參考資料

[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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金魚增一
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