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
赤緯	+34° 08′ 24″
距離	4.34 ± 0.87 kly（1.330 ± 0.266 kpc）
視星等 (V)	6.3
視大小 (V)	10 弧分
物理特徵
質量	746+606; −334 M☉
半徑	7 ly
估計年齡	25.1 Myr
其他特徵	C 0532+341, M 36, NGC 1960, OCl 445
	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]。

這個星團的角直徑是7001100000000000000♠10 弧分^[2]，核心半徑是7000320000000000000♠3.2 弧分^[8]。它的質量大約為7002746000000000000♠746 太陽質量，線性的潮汐半徑為7001106000000000000♠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7001263000000000000♠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7001220000000000000♠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

参见

參考資料

^ ^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 , doi:10.1111/j.1365-2966.2009.15416.x.
^ ^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.
^ ^3.0 ^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.
^ M 36. SIMBAD. 斯特拉斯堡天文資料中心.
^ 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.
^ 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）
^ 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）.
^ ^8.0 ^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 , doi:10.1093/mnras/stt1180.
^ 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 , doi:10.1111/j.1365-2966.2011.20032.x.
^ 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

WikiSky上关于M36 (疏散星团)的内容：DSS2, SDSS, GALEX, IRAS, 氢α, X射线, 天文照片, 天图, 文章和图片

天球赤道座標： 05^h 36^m 12^s，34° 08′ 04″

[Wu2009a-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 , doi:10.1111/j.1365-2966.2009.15416.x.

[Sanner2000-2] 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.

[Piskunov2008-3] 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.

[SIMBAD-4] M 36. SIMBAD. 斯特拉斯堡天文資料中心.

[FoderaSerio1985-5] 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.

[Stoyan2008-6] 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）

[Frommert2007-7] 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）.

[Jeffries2013-8] 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 , doi:10.1093/mnras/stt1180.

[Smith2012-9] 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 , doi:10.1111/j.1365-2966.2011.20032.x.

[Delgado1984-10] 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.

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