玉井三

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，視星等2.796，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） 。 玉井三 (波江座β)的光譜類型是A3 III ，其中的III指出在光度分類中是已經耗盡核心的氫，離開主序帶的巨星。 外層的有效溫度大約是8,104K，因此是顆白色色調的A型恆星。這顆投影自轉速度高達196 km s–1，相較於太陽赤道的2 km s–1，是非常的快速。這顆恆星的視星等在2.72-2.80 據報尤其於1985年曾有強勁爆發。 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。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°，在CCDMJ目錄上的編號為 CCDM J05079-0506B.。 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、玉井二和玉井四。 在中國，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)和玉井二 (波江座ψ)。當然，玉井三 (波江座β)也包含在內。 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ψ是Al Kursiyy al Jauzah I，波江座λ是Al Kursiyy al Jauzah II (排除了獵戶座τ)。 科幻中的玉井三。 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  Cousins, A. W. J., Standardization of Broadband Photometry of Equatorial Standards, South African Astronomical Observatory Circulars, 1984, 8: 59, Bibcode:1984SAAOC...8...59C  Royer, F.; et al, Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i, Astronomy and Astrophysics, October 2002, 393: 897–911, Bibcode:2002A&A...393..897R, arXiv:astro-ph/0205255 , doi:10.1051/0004-6361:20020943  HR 1666 （页面存档备份，存于互联网档案馆）, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50 （页面存档备份，存于互联网档案馆）. Accessed on line September 17, 2008. King, Jeremy R.; et al, 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, Bibcode:2003AJ....125.1980K, doi:10.1086/368241  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  Kamp, I.; Hempel, M.; Holweger, H., Do dusty A stars exhibit accretion signatures in their photospheres?, Astronomy and Astrophysics, June 2002, 388: 978–984, Bibcode:2002A&A...388..978K, arXiv:astro-ph/0204449 , doi:10.1051/0004-6361:20020493  Allen, R. H., Star Names: Their Lore and Meaning Reprint, New York, NY: Dover Publications Inc: 218, 1963 [2010-12-12], ISBN 0-486-21079-0, （原始内容存档于2023-07-01）  Moore, Patrick, The amateur astronomer, Patrick Moore's Practical Astronomy Series 12th, Birkhäuser: 200, 2006, ISBN 1-85233-878-4  bet Eri -- Variable Star, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-01-10], （原始内容存档于2016-03-15）  Kaler, James B., Cursa (Beta Eridani), Stars (University of Illinois), [2012-01-10], （原始内容存档于2012-05-02）  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）  Unsöld, Albrecht; Baschek, B., The new cosmos: an introduction to astronomy and astrophysics 5th, Springer: 167, 2001, ISBN 3-540-67877-8  NSV 1841, database entry, New Catalogue of Suspected Variable Stars, the improved version （页面存档备份，存于互联网档案馆）, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 17, 2008. Brunner, B. H., A Flare of Beta-Eridani, Sky and Telescope, June 1985, 69 (6): 484, Bibcode:1985S&T....69R.484B  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  BD-05 1162B -- Star in double system, database entry, SIMBAD. Accessed on line September 17, 2008. （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. （中文） 香港太空館 - 研究資源 - 亮星中英對照表 互联网档案馆的存檔，存档日期2009-09-29., Hong Kong Space Museum. Accessed on line November 23, 2010. 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 (PDF). [2012-12-30]. （原始内容存档 (PDF)于2013-10-29）.