玉井三

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波江座β
Diagram showing star positions and boundaries of the Eridanus constellation and its surroundings
Cercle rouge 100%.svg

波江座β的位置 (圓圈)
觀測資料
曆元 J2000.0
星座 波江座
星官 玉井 (參宿)
赤經 05h 07m 50.98549s[1]
赤緯 −05° 05′ 11.2055″[1]
視星等(V) 2.796[2]
特性
光谱分类 A3 III var[3]
U−B 色指数 +0.124[2]
B−V 色指数 +0.110[2]
R−I 色指数 +0.08[4]
天体测定
径向速度 (Rv) –3.6[5] km/s
自行 (μ) 赤经:-82.82[1] mas/yr
赤纬:-75.39[1] mas/yr
视差 (π) 36.50 ± 0.42[1] mas
距离 89 ± 1 ly
(27.4 ± 0.3 pc)
詳細資料
質量 2.6[6] M
半徑 3.55[6] R
表面重力 (log g) 3.58[5]
亮度 52[6] L
溫度 8,104[5] K
金属量 [Fe/H] –0.4[7] dex
自轉速度 (v sin i) 196[3] km/s
其他命名
Cursa, Dhalim,[8] Kursa,[9] β Eri, Beta Eridani, Beta Eri, 67 Eridani, 67 Eri, BD−05 1162, CCDM J05079-0506A, FK5 188, GC 6274, GJ 9175, HD 33111, HIP 23875, HR 1666, IDS 05030-0513 A, PPM 187729, SAO 131794, WDS 05078-0505A.[10]
參考資料庫
SIMBAD data

玉井三 (波江座β) 是波江座的第二亮星,位於這個星座東北方的邊界,靠近獵戶座之處。它的固有名稱是Cursa[4][11]視星等2.796[2],所以用肉眼就可以直接看見。視差測量出這顆恆星與地球的距離大約是89光年(27秒差距[1]

性質[编辑]

玉井三 (波江座β)的光譜類型是A3 III [3],其中的III指出在光度分類中是已經耗盡核心的氫,離開主序帶巨星。 外層的有效溫度大約是8,104K[5],因此是顆白色色調的A型恆星[12]。這顆投影自轉速度高達196 km s–1[3],相較於太陽赤道2 km s–1,是非常的快速[13]。這顆恆星的視星等在2.72-2.80[14] 據報尤其於1985年曾有強勁爆發[11][15]

這顆星的位置和移動軌跡顯示它是大熊座星群的成員,一個恆星的集團,它們在空間中有著共同的來源和移動方向。但是,它在光度測量上的屬性顯示他可能只是個闖入者[5]。玉井三有一顆視星等10.90等的光學伴星角距離為120弧秒方位角 148°[16],在CCDMJ目錄上的編號為 CCDM J05079-0506B.[17]

語源[编辑]

Cursa衍生於Al Kursiyy al Jauzah,意思是"中央的椅子 (或"腳凳") "。這個名稱之下的恆星組合還包括玉井一天園三玉井四[8]

依據恆星目錄的技術備忘錄33-507 – 一份包含537顆恆星的精簡目錄,Al Kursiyy al Jauzah含有三顆的標題:波江座β是Cursa波江座φAl Kursiyy al Jauzah I波江座λAl Kursiyy al Jauzah II (排除了獵戶座τ)[18]

中國,這顆恆星稱為玉井三,也就是星官玉井的第三顆星。這個小星群還包括玉井一 (波江座λ)、玉井四 (獵戶座τ?)和天園三 (波江座φ)[19]。當然,玉井三 (波江座β)也包含在內[8][20]

相關條目[编辑]

参考文献[编辑]

  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, doi:10.1051/0004-6361:20078357, Bibcode 2007A&A...474..653V 
  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 3.2 3.3 Royer, F. ., Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i, Astronomy and Astrophysics. October 2002, 393: 897–911, doi:10.1051/0004-6361:20020943, Bibcode 2002A&A...393..897R 
  4. ^ 4.0 4.1 HR 1666, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 17, 2008.
  5. ^ 5.0 5.1 5.2 5.3 5.4 King, Jeremy R. ., Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group, The Astronomical Journal. April 2003, 125 (4): 1980–2017, doi:10.1086/368241, Bibcode 2003AJ....125.1980K 
  6. ^ 6.0 6.1 6.2 Malagnini, M. L.; Morossi, C., Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars, Astronomy and Astrophysics Supplement Series. November 1990, 85 (3): 1015–1019, Bibcode 1990A&AS...85.1015M 
  7. ^ Kamp, I.; Hempel, M.; Holweger, H., Do dusty A stars exhibit accretion signatures in their photospheres?, Astronomy and Astrophysics. June 2002, 388: 978–984, doi:10.1051/0004-6361:20020493, Bibcode 2002A&A...388..978K 
  8. ^ 8.0 8.1 8.2 Allen, R. H., Star Names: Their Lore and Meaning. Reprint, New York, NY: Dover Publications Inc. 1963:  218 [2010-12-12], ISBN 0-486-21079-0 
  9. ^ Moore, Patrick, The amateur astronomer, Patrick Moore's Practical Astronomy Series. 12th, Birkhäuser. 2006:  200, ISBN 1-85233-878-4 
  10. ^ bet Eri -- Variable Star, SIMBAD. Centre de Données astronomiques de Strasbourg [2012-01-10] 
  11. ^ 11.0 11.1 Kaler, James B., Cursa (Beta Eridani), Stars. University of Illinois [2012-01-10] 
  12. ^ The Colour of Stars, Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004 [2012-01-16] 
  13. ^ Unsöld, Albrecht; Baschek, B., The new cosmos: an introduction to astronomy and astrophysics. 5th, Springer. 2001:  167, ISBN 3-540-67877-8 
  14. ^ NSV 1841, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 17, 2008.
  15. ^ Brunner, B. H., A Flare of Beta-Eridani, Sky and Telescope. June 1985, 69 (6): 484, Bibcode 1985S&T....69R.484B 
  16. ^ Mason, B. D.; Wycoff, G. L.; Hartkopf, W. I.; Douglass, G. G.; Worley, C. E., The Washington Visual Double Star Catalog (Mason+ 2001-2011), VizieR On-line Data Catalog: B/wds. Originally published in: 2001AJ....122.3466M. November 2011, Bibcode 2011yCat....102026M 
  17. ^ BD-05 1162B -- Star in double system, database entry, SIMBAD. Accessed on line September 17, 2008.
  18. ^ Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
  19. ^ (中文) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  20. ^ (中文) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.