M52

M 52
M 52
	创建者：2MASS/NASA
观测资料 (J2000 历元)
星座	仙后座
赤经	23h 24m 48.0s
赤纬	+61° 35′ 36″
距离	4.6 kly（1.4 kpc）
视星等 (V)	5.0
视大小 (V)	13.0′
物理特征
质量	1,200 M☉ M☉
半径	9.5 ly
估计年龄	158.5 Myr
其他特征	NGC 7654、Cr 455, C 2322+613, OCl 260
	相关条目：疏散星团、NGC天体表

M52或梅西耶52，也称为NGC 7654，是在北天仙后座的一个疏散星团。它是查尔斯·梅西耶在1774年9月7日发现的^[2]。在地球上，使用双筒望远镜就可以看见这个星团。这个星团的南半部受到消光的影响非常明显^[5]。

罗伯特·朱利斯·特朗普勒（英语：Robert Julius Trumpler）在他的特朗普勒分类法将M52分类为 II2r，表示星团低度向中心集中，亮星和暗星的数量相当，而且星数众多（超过100颗）^[6]。后来，改分为I2r，表示向中心高度集中，有密集的核心^[5]。这个星团的核心半径是2.97 ± 0.46 ly（0.91 ± 0.14 pc），潮汐半径为42.7 ± 7.2 ly（13.1 ± 2.2 pc）^[3]。估计年龄约1.585亿年^[1]，质量约7033238625999999999♠1,200 M_☉.^[3]。

视星等+8.3的超巨星BD+ 60°2532可能是M52的成员^[3]。其它的成员包括18颗慢脉动B型变星T，其中一颗是盾牌座δ型变星，3颗是剑鱼座γ型变星 ^[7]；可能还有3颗Be星 ^[8]。星团的核心缺乏星际物质，这可能是星团早期历史有超新星爆炸的结果^[5]。

参考资料

^ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 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 Adam, Len, Imaging the Messier Objects Remotely from Your Laptop, The Patrick Moore Practical Astronomy Series, Springer: 241, 2018, Bibcode:2018imor.book.....A, ISBN 978-3319653853
^ ^3.0 ^3.1 ^3.2 ^3.3 Bonatto, C.; Bica, E., Methods for improving open cluster fundamental parameters applied to M 52 and NGC 3960, Astronomy and Astrophysics, September 2006, 455 (3): 931–942, Bibcode:2006A&A...455..931B, arXiv:astro-ph/0608022  , doi:10.1051/0004-6361:20065315
^ M 52. SIMBAD. 斯特拉斯堡天文资料中心.
^ ^5.0 ^5.1 ^5.2 Pandey, A. K.; et al, NGC 7654: An interesting cluster to study star formation history, Astronomy and Astrophysics, August 2001, 374 (2): 504–522, Bibcode:2001A&A...374..504P, doi:10.1051/0004-6361:20010642  .
^ Trumpler, Robert Julius, Preliminary results on the distances, dimensions and space distribution of open star clusters, Lick Observatory Bulletin, 1930, 420: 154–188, Bibcode:1930LicOB..14..154T, doi:10.5479/ADS/bib/1930LicOB.14.154T  .
^ Luo, Y. P.; et al, Discovery of 14 New Slowly Pulsating B Stars in the Open Cluster NGC 7654, The Astrophysical Journal Letters, February 2012, 746 (1): 5, Bibcode:2012ApJ...746L...7L, doi:10.1088/2041-8205/746/1/L7, L7.
^ Bond, Howard E., Be Stars in the Galactic Cluster M 52, Publications of the Astronomical Society of the Pacific, August 1973, 85 (506): 405, Bibcode:1973PASP...85..405B, doi:10.1086/129477  .

外部链接

维基共享资源上的相关多媒体资源：M52
Messier 52, SEDS Messier pages （页面存档备份，存于互联网档案馆）
WikiSky上关于M52的内容：DSS2, SDSS, GALEX, IRAS, 氢α, X射线, 天文照片, 天图, 文章和图片

天文学目录
NGC天体表：	NGC 7652 - NGC 7653 - NGC 7654 - NGC 7655 - NGC 7656

[Wu2009-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 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.

[Adam2018-2] 2.0 ^2.1 ^2.2 Adam, Len, Imaging the Messier Objects Remotely from Your Laptop, The Patrick Moore Practical Astronomy Series, Springer: 241, 2018, Bibcode:2018imor.book.....A, ISBN 978-3319653853

[Bonatto2006-3] 3.0 ^3.1 ^3.2 ^3.3 Bonatto, C.; Bica, E., Methods for improving open cluster fundamental parameters applied to M 52 and NGC 3960, Astronomy and Astrophysics, September 2006, 455 (3): 931–942, Bibcode:2006A&A...455..931B, arXiv:astro-ph/0608022  , doi:10.1051/0004-6361:20065315

[SIMBAD-4] M 52. SIMBAD. 斯特拉斯堡天文资料中心.

[Pandey2001-5] 5.0 ^5.1 ^5.2 Pandey, A. K.; et al, NGC 7654: An interesting cluster to study star formation history, Astronomy and Astrophysics, August 2001, 374 (2): 504–522, Bibcode:2001A&A...374..504P, doi:10.1051/0004-6361:20010642  .

[Trumpler1930-6] Trumpler, Robert Julius, Preliminary results on the distances, dimensions and space distribution of open star clusters, Lick Observatory Bulletin, 1930, 420: 154–188, Bibcode:1930LicOB..14..154T, doi:10.5479/ADS/bib/1930LicOB.14.154T  .

[Luo2012-7] Luo, Y. P.; et al, Discovery of 14 New Slowly Pulsating B Stars in the Open Cluster NGC 7654, The Astrophysical Journal Letters, February 2012, 746 (1): 5, Bibcode:2012ApJ...746L...7L, doi:10.1088/2041-8205/746/1/L7, L7.

[Bond1973-8] Bond, Howard E., Be Stars in the Galactic Cluster M 52, Publications of the Astronomical Society of the Pacific, August 1973, 85 (506): 405, Bibcode:1973PASP...85..405B, doi:10.1086/129477  .

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