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M36 (疏散星团)

M36
疏散星團「M 36」的紅外光影像;來源:[1]
觀測資料 (J2000.0 曆元)
星座御夫座
赤經05h 36m 18.0s[1]
赤緯+34° 08′ 24″[1]
距離4.34 ± 0.87 kly(1.330 ± 0.266 kpc[1]
視星等 (V)6.3
視大小 (V)10 弧分[2]
物理特徵
質量746+606
−334
[3] M
半徑7 ly
估計年齡25.1 Myr[1]
其他特徵C 0532+341, M 36, NGC 1960, OCl 445[4]
相關條目:疏散星团NGC天體表

M36,也稱為NGC 1960,是在御夫座的一個疏散星團。它是喬瓦尼·巴蒂斯塔·霍迪納英语Giovanni Batista Hodierna在1654年之前發現的,當時被描述成一個模糊的斑塊[5]。這個星團於1749年被纪晓姆·勒让提獨立再度發現,然後梅西耶在1749年觀察到它收錄至目錄中[6]。M36距離地球大約1,330秒差距光年(4,340光年[1]。這個星團與昴宿星團(M45)非常相似,如果與地球的距離相同,它們的大小將會相近[7]

這個星團的角直徑10 弧分[2],核心半徑是3.2 弧分[8]。它的質量大約為746 太陽質量,線性的潮汐半徑10.6±1.6 秒差距[3]。吳等人(2009年)根據測光學估計該星團的年齡為2,500萬年[1]而貝爾(Bell)等人提供的估計值是26.3+3.2
−5.2
 百萬年(2013年)。在恆星中的光度有未消耗掉的鋰,意味著年齡約為22±4百萬年,這與前面的估計吻合[8]

M36只有10顆視星等比10等亮的恆星[8]和178顆光度至14等以下的恆星[2]。有38顆成員顯示有紅外過量,而且其中有一顆特別高[9]。有一顆視星等9等的恆星是B型變星的候選者[10]

星圖

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Map

参见

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參考資料

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  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 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 2.2 Sanner, J.; et al, Photometric and kinematic studies of open star clusters. II. NGC 1960 (M 36) and NGC 2194, Astronomy and Astrophysics, May 2000, 357: 471–483, Bibcode:2000A&A...357..471S. 
  3. ^ 3.0 3.1 Piskunov, A. E.; et al, Tidal radii and masses of open clusters, Astronomy and Astrophysics, January 2008, 477 (1): 165–172, Bibcode:2008A&A...477..165P, doi:10.1051/0004-6361:20078525. 
  4. ^ [ M 36] 请检查|url=值 (帮助). SIMBAD. 斯特拉斯堡天文資料中心. 
  5. ^ Fodera-Serio, G.; et al, Hodierna's Observations of Nebulae and his Cosmology, Journal for the History of Astronomy, February 1985, 16 (1): 1, Bibcode:1985JHA....16....1F. 
  6. ^ Stoyan, Ronald; et al, Atlas of the Messier Objects: Highlights of the Deep Sky, 由Schroeder, Klaus-Peter翻译, Cambridge University Press: 530–533, 2008 [2019-02-13], ISBN 1139473115, (原始内容存档于2019-02-17) 
  7. ^ Frommert, Hartmut; Kronberg, Christine, Messier 36, The Messier Catalog (Students for the Exploration and Development of Space (SEDS)), August 25, 2007 [2018-11-24], (原始内容存档于2018-10-04). 
  8. ^ 8.0 8.1 8.2 Jeffries, R. D.; et al, A lithium depletion boundary age of 22 Myr for NGC 1960, Monthly Notices of the Royal Astronomical Society, September 2013, 434 (3): 2438–2450, Bibcode:2013MNRAS.434.2438J, arXiv:1306.6339可免费查阅, doi:10.1093/mnras/stt1180. 
  9. ^ Smith, R.; Jeffries, R. D., Dust discs around intermediate-mass and Sun-like stars in the 16 Myr old NGC 1960 open cluster, Monthly Notices of the Royal Astronomical Society, March 2012, 420 (4): 2884–2898, Bibcode:2012MNRAS.420.2884S, arXiv:1110.4219可免费查阅, doi:10.1111/j.1365-2966.2011.20032.x. 
  10. ^ Delgado, A. J.; et al, Search for B-Type Variable Stars in Open Clusters, Information Bulletin on Variable Stars, October 1984, 2603: 1, Bibcode:1984IBVS.2603....1D. 

外部連結

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M36 (疏散星团)
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