開陽增一

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開陽增一、輔
Dipper.jpg
開陽和開陽增一在北斗七星中的位置
觀測資料
曆元 J2000.0
星座 大熊座
星官
赤經 13h 25m 13.53783s[1]
赤緯 +54° 59′ 16.6548″[1]
視星等(V) +3.99[2]
特性
光谱分类A5Vn[3] / M3-4[4]
天体测定
徑向速度 (Rv)−9.6[5] km/s
视差 (π)39.91 ± 0.13[1] mas
距离81.7 ± 0.3 ly
(25.06 ± 0.08 pc)
绝对星等 (MV)+2.00[2]
詳細資料
Alcor A
質量1.84[6] M
半徑1.846[7] R
表面重力 (log g)4.25[8]
亮度14.03[6] L
溫度8,221[8] K
自轉速度 (v sin i)228[6] km/s
Alcor B
質量0.25[4] M
年齡0.5 ± 0.1[2] Gyr
其他命名
g Ursae Majoris, 80 Ursae Majoris, BD+55 1603, CCDM J13240+5456D, GC 18155, HD 116842, HIP 65477, HR 5062, PPM 34021, SAO 28751, WDS J13239+5456C
參考資料庫
SIMBADdata

開陽增一(英語:Alcor /ˈælkɔːr/[9])是大熊座的一個雙星系統。它是開陽的較暗淡的伴星,两星共同構成裸眼可辨別的目視雙星,位於北斗七星的柄上。根據依巴谷卫星測量,兩者都位於距離太阳約83光年處。

命名法[编辑]

根據佛蘭斯蒂德命名法,開陽增一的名稱為大熊座80(Ursae Majoris 80)。Alcor來自阿拉伯语سها Suhā/Sohā,意為是「被遺忘者」或「被忽略者」,作為開陽的伴星而聞名。[10]

2016年,國際天文聯會組織了IAU星名工作组英语IAU Working Group on Star Names(WGSN)[11],对恒星的专名进行分类和标准化。WGSN于2016年7月发布的第一份公告包含了WGSN批准的首两批名称的表格[12];其中包括大熊座80的西方名Alcor。[13]

參見[编辑]

參考文獻[编辑]

  1. ^ 1.0 1.1 1.2 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 Mamajek, Eric E.; Kenworthy, Matthew A.; Hinz, Philip M.; Meyer, Michael R. Discovery of a Faint Companion to Alcor Using MMT/AO 5 μm Imaging. The Astronomical Journal. 2010, 139 (3): 919–925. Bibcode:2010AJ....139..919M. arXiv:0911.5028可免费查阅. doi:10.1088/0004-6256/139/3/919. 
  3. ^ Gray, R. O; Garrison, R. F. The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation. Astrophysical Journal Supplement Series. 1989, 70: 623. Bibcode:1989ApJS...70..623G. doi:10.1086/191349. 
  4. ^ 4.0 4.1 Zimmerman, Neil; Oppenheimer, Ben R; Hinkley, Sasha; Brenner, Douglas; Parry, Ian R; Sivaramakrishnan, Anand; Hillenbrand, Lynne; Beichman, Charles; Crepp, Justin R; Vasisht, Gautam; Roberts, Lewis C; Burruss, Rick; King, David L; Soummer, Rémi; Dekany, Richard; Shao, Michael; Bouchez, Antonin; Roberts, Jennifer E; Hunt, Stephanie. Parallactic Motion for Companion Discovery: An M-Dwarf Orbiting Alcor. The Astrophysical Journal. 2010, 709 (2): 733–740. Bibcode:2010ApJ...709..733Z. arXiv:0912.1597可免费查阅. doi:10.1088/0004-637X/709/2/733. 
  5. ^ Kidger, Mark R; Martín-Luis, Fabiola. High-Precision Near-Infrared Photometry of a Large Sample of Bright Stars Visible from the Northern Hemisphere. The Astronomical Journal. 2003, 125 (6): 3311. Bibcode:2003AJ....125.3311K. doi:10.1086/374996. 
  6. ^ 6.0 6.1 6.2 Zorec, J; Royer, F. Rotational velocities of A-type stars. IV. Evolution of rotational velocities. Astronomy & Astrophysics. 2012, 537: A120. Bibcode:2012A&A...537A.120Z. arXiv:1201.2052可免费查阅. doi:10.1051/0004-6361/201117691. 
  7. ^ Jones, Jeremy; White, R. J; Boyajian, T; Schaefer, G; Baines, E; Ireland, M; Patience, J; Ten Brummelaar, T; McAlister, H; Ridgway, S. T; Sturmann, J; Sturmann, L; Turner, N; Farrington, C; Goldfinger, P. J. The Ages of A-Stars. I. Interferometric Observations and Age Estimates for Stars in the Ursa Major Moving Group. The Astrophysical Journal. 2015, 813 (1): 58. Bibcode:2015ApJ...813...58J. arXiv:1508.05643可免费查阅. doi:10.1088/0004-637X/813/1/58. 
  8. ^ 8.0 8.1 David, Trevor J; Hillenbrand, Lynne A. The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets. The Astrophysical Journal. 2015, 804 (2): 146. Bibcode:2015ApJ...804..146D. arXiv:1501.03154可免费查阅. doi:10.1088/0004-637X/804/2/146. 
  9. ^ Kunitzsch, Paul; Smart, Tim. A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations 2nd rev. Cambridge, Massachusetts: Sky Pub. 2006. ISBN 978-1-931559-44-7. 
  10. ^ Bohigian, George M. An Ancient Eye Test—Using the Stars. Survey of Ophthalmology. 2008, 53 (5): 536–9. PMID 18929764. doi:10.1016/j.survophthal.2008.06.009. 
  11. ^ IAU Working Group on Star Names (WGSN). [22 May 2016]. 
  12. ^ Bulletin of the IAU Working Group on Star Names, No. 1 (PDF). [28 July 2016]. 
  13. ^ IAU Catalog of Star Names. [28 July 2016]. 

外部链接[编辑]