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野鴨星團

Wild Duck Cluster
野鴨星團(M11,NGC 6705)
觀測資料 (J2000.0 曆元)
星座盾牌座
赤經18h 51m 05.0s[1]
赤緯-06° 16′ 12″[1]
距離6,120光年(1,877秒差距[2]
視星等 (V)5.8[3]
視大小 (V)22.8′[2]
物理特徵
質量11,000[4] M
半徑95光年[4]
估計年齡316±50 myr[5]
其他特徵M 11、NGC 6705、Cr 391、Mel英语Melotte catalogue 213、OCl 76.0[6]
相關條目:疏散星团NGC天體表

野鴨星團(也稱為M11,或NGC 6705)是在盾牌座的一個疏散星團。它是戈特弗里德·基希在1681年發現的[3]夏爾·梅西耶在1764年將它收錄在非星天體的目錄中。它的名稱源自星團中較明亮恆星的排列形成一個三角形,類似於一群野鴨飛行的隊形[3],或者換個角度看,像是一隻游泳的鴨子。這個星團位於盾牌座恆星雲中點的東邊[7]

性質

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野鴨星團是已知的疏散星團中恆星數量最豐富、最緊湊的星團之一。它是已知規模最大的疏散星團之一,並已經被廣泛的研究過。它的年齡大約是3億1,600萬年[5],核心半徑是1.23 pc,而潮汐半徑29 pc。依據使用的方法,估計星團的質量介於3,700 M[8]11,000 M之間[4],最亮恆星的視星等是8等,至16.5等的恆星總數約870顆。它的集成絕對星等是-6.5等,可見光的消光為1.3星等[7]

這個星團是富金屬量,鐵豐度的[Fe/H] = 0.17±0.04。儘管它很年輕,但顯示出氦核作用元素的增強,這可能是因為它誕生於分子雲中鄰近II型超新星爆炸區的附近[5]。至少有9顆極有可能是變星,其中有兩顆可能是聯星;還有29顆有可能是變星[9]。這個星團距離銀河中心6.8 kpc,靠近銀河平面,並未遠離其出生地[5]

圖集

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相關條目

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參考資料

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  1. ^ 1.0 1.1 Wu, Zhen-Yu; et al, The orbits of open clusters in the Galaxy, Monthly Notices of the Royal Astronomical Society, November 2009, 399 (4): 2146–2164, Bibcode:2009MNRAS.399.2146W, arXiv:0909.3737可免费查阅, doi:10.1111/j.1365-2966.2009.15416.x. 
  2. ^ 2.0 2.1 Kharchenko, N. V.; et al, Astrophysical parameters of Galactic open clusters, Astronomy and Astrophysics, 2005, 438 (3): 1163–1173, Bibcode:2005A&A...438.1163K, arXiv:astro-ph/0501674可免费查阅, doi:10.1051/0004-6361:20042523. 
  3. ^ 3.0 3.1 3.2 O'Meara, Stephen James; Levy, David H., Deep-Sky Companions: The Messier Objects, Cambridge University Press: 65, 1998 [2020-08-13], ISBN 978-0521553322, (原始内容存档于2023-07-28). 
  4. ^ 4.0 4.1 4.2 Santos, J. F. C., Jr.; et al, Structure and stellar content analysis of the open cluster M 11 with 2MASS photometry, Astronomy and Astrophysics, October 2005, 442 (1): 201–209, Bibcode:2005A&A...442..201S, arXiv:astro-ph/0507216可免费查阅, doi:10.1051/0004-6361:20053378. 
  5. ^ 5.0 5.1 5.2 5.3 Casamiquela, L.; et al, NGC 6705 a young α-enhanced open cluster from OCCASO data, Astronomy & Astrophysics, March 2018, 610: 10, Bibcode:2018A&A...610A..66C, arXiv:1710.11069可免费查阅, doi:10.1051/0004-6361/201732024, A66. 
  6. ^ [ M 11] 请检查|url=值 (帮助). SIMBAD. 斯特拉斯堡天文資料中心. 
  7. ^ 7.0 7.1 Crossen, Craig; Rhemann, Gerald, Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes, Springer Science & Business Media: 56, 2012, ISBN 978-3709106266. 
  8. ^ Cantat-Gaudin, T.; et al, The Gaia-ESO Survey: Stellar content and elemental abundances in the massive cluster NGC 6705, Astronomy & Astrophysics, September 2014, 569: 18, Bibcode:2014A&A...569A..17C, arXiv:1407.1510可免费查阅, doi:10.1051/0004-6361/201423851, A17. 
  9. ^ Messina, S.; et al, ACE-OC project: rotation and variability in the open cluster M 11 (NGC 6705), Astronomy and Astrophysics, April 2010, 513: 26, Bibcode:2010A&A...513A..29M, arXiv:0912.4131可免费查阅, doi:10.1051/0004-6361/200912373, A29. 
  10. ^ Wild cosmic ducks. www.spacetelescope.org. [25 March 2019]. (原始内容存档于2020-06-18) (英语). 
  11. ^ Wild Ducks Take Flight in Open Cluster. www.eso.org. European Southern Observatory. [3 October 2014]. (原始内容存档于2017-06-19). 

外部連結

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野鴨星團
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