M39 (疏散星团)

梅西耶39 （Messier 39）
	在天鹅座的疏散星团M39
观测数据 (J2000 历元)
星座	天鹅座
赤经	21h 31m 48.0s
赤纬	+48° 26′ 00″
距离	1,010 ly（311 pc） ()
视星等 (V)	4.6
视直径 (V)	29′
物理性质
质量	232+210; −110 M☉
估计年龄	278.6Myr
其他名称（标示）	M 39、NGC 7092、Cr 438
	相关条目：疏散星团、疏散星团列表

梅西耶39或M39，也称为NGC 7092，是在天鹅座的一个疏散星团，位于恒星螣蛇四（英语：Pi Cygni）南面两度处^[7]，和天津四东北偏东9°左右^[8]。这个星团于1749年由纪尧姆·勒让蒂发现，然后查尔斯·梅西耶于1764年将其添加到他的星表中^[7]^[9]。当用小望远镜在低倍率下观察时，这个星团显示了大约24个成员^[7]，但双筒望远镜是观察它的最佳工具^[7]。它的总星等（亮度）为5.5，跨越的角直径为7001290000000000000♠29 弧分^[4]，相当于满月的大小^[8]。它的中心与地球的距离大约是1,010光年（311秒差距）^[2]。

估计这个星团的质量为7032461343600000000♠232 M_☉，线性的潮汐半径为7017265368272006178♠8.6±1.8 pc^[5]。在15颗最亮的成员中，有6个形成了联星系统；还有一个颗也可能是。HD 205117 是一个可能的食双星系统，其周期为113.2天，视星等的变化0.051。两个成员似乎都是次巨星 ^[10]，而且星团里面至少有五颗 ^[11]特殊恒星和10颗^[12]疑似短周期变星。

星图[编辑]

参考资料[编辑]

^ ^1.0 ^1.1 ^1.2 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, S2CID 6066790, arXiv:0909.3737 , doi:10.1111/j.1365-2966.2009.15416.x.
^ ^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, S2CID 9079873, arXiv:astro-ph/0501674 , doi:10.1051/0004-6361:20042523.
^ 梅西耶39. SEDS Messier Catalog. [2022年4月29日]. （原始内容存档于2022年8月16日）.
^ ^4.0 ^4.1 WEBDA page Lynga catalogue data, Department of Theoretical Physics and Astrophysics of the Masaryk University, [18 February 2018], （原始内容存档于2012-03-26）.
^ ^5.0 ^5.1 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 39. SIMBAD. 斯特拉斯堡天文资料中心.
^ ^7.0 ^7.1 ^7.2 ^7.3 Streicher, Magda, Sky Delights: Another Cross, Monthly Notes of the Astronomical Society of Southern Africa, October 2015, 74 (10): 243–248, Bibcode:2015MNSSA..74..243S.
^ ^8.0 ^8.1 Bone, Neil, Sky notes for 2005 August and September, Journal of the British Astronomical Association, August 2005, 115 (4): 230, Bibcode:2005JBAA..115..230B.
^ 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 [2022-09-05], ISBN 978-1139473118, （原始内容存档于2022-09-05）
^ Zakirov, M. M.; et al, Variability of HD205117 in the Open Cluster M39 (NGC 7092), Information Bulletin on Variable Stars, July 1995, 4220: 1, Bibcode:1995IBVS.4220....1Z.
^ Gray, R. O.; Corbally, C. J., A Spectroscopic Search for λ Bootis and Other Peculiar A-Type Stars in Intermediate-Age Open Clusters, The Astronomical Journal, August 2002, 124 (2): 989–1000, Bibcode:2002AJ....124..989G, doi:10.1086/341609 .
^ Schuff, Sarah; et al, A Search for Variable Stars in the Field of NGC 7092 (M39), Bulletin of the American Astronomical Society, December 2006, 38: 1135, Bibcode:2006AAS...20916514S.

外部链接[编辑]

Messier 39, SEDS Messier pages （页面存档备份，存于互联网档案馆）
NASA Astronomy Picture of the Day: M39: Open Cluster in Cygnus (12 April 2009)
WikiSky上关于M39 (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

天球赤道座标： 21^h 31^m 08^s，48° 27′ 00″

[Wu2009-1] 1.0 ^1.1 ^1.2 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, S2CID 6066790, arXiv:0909.3737 , doi:10.1111/j.1365-2966.2009.15416.x.

[kharchenko2005-2] 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, S2CID 9079873, arXiv:astro-ph/0501674 , doi:10.1051/0004-6361:20042523.

[3] 梅西耶39. SEDS Messier Catalog. [2022年4月29日]. （原始内容存档于2022年8月16日）.

[webda2018a-4] 4.0 ^4.1 WEBDA page Lynga catalogue data, Department of Theoretical Physics and Astrophysics of the Masaryk University, [18 February 2018], （原始内容存档于2012-03-26）.

[Piskunov2008-5] 5.0 ^5.1 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-6] M 39. SIMBAD. 斯特拉斯堡天文资料中心.

[Magda2015-7] 7.0 ^7.1 ^7.2 ^7.3 Streicher, Magda, Sky Delights: Another Cross, Monthly Notes of the Astronomical Society of Southern Africa, October 2015, 74 (10): 243–248, Bibcode:2015MNSSA..74..243S.

[Bone2005-8] 8.0 ^8.1 Bone, Neil, Sky notes for 2005 August and September, Journal of the British Astronomical Association, August 2005, 115 (4): 230, Bibcode:2005JBAA..115..230B.

[Stoyan2008-9] 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 [2022-09-05], ISBN 978-1139473118, （原始内容存档于2022-09-05）

[Zakirov1995-10] Zakirov, M. M.; et al, Variability of HD205117 in the Open Cluster M39 (NGC 7092), Information Bulletin on Variable Stars, July 1995, 4220: 1, Bibcode:1995IBVS.4220....1Z.

[Gray2002-11] Gray, R. O.; Corbally, C. J., A Spectroscopic Search for λ Bootis and Other Peculiar A-Type Stars in Intermediate-Age Open Clusters, The Astronomical Journal, August 2002, 124 (2): 989–1000, Bibcode:2002AJ....124..989G, doi:10.1086/341609 .

[Schuff2006-12] Schuff, Sarah; et al, A Search for Variable Stars in the Field of NGC 7092 (M39), Bulletin of the American Astronomical Society, December 2006, 38: 1135, Bibcode:2006AAS...20916514S.

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