M46 (疏散星团)

梅西耶 46
观测资料 (J2000.0 历元)
星座	船尾座
赤经	07h 41m 46.0s
赤纬	−14° 48′ 36″
距离	4.92 ± 0.98 kly（1.510 ± 0.302 kpc）
视星等 (V)	6.1
视大小 (V)	22.8′
物理特征
质量	453+214; −145 M☉
半径	37.8 ly
估计年龄	251.2 Myr
值得注意特征	包含叠加的; 行星状星云NGC 2438
其他特征	C 0739-147, M64, NGC 2437, OCl 601.0
	相关条目：疏散星团、NGC天体表

梅西耶46或M46，也称为NGC 2437，是在船尾座的一个疏散星团。它于1771年被梅西耶发现，Dreyer描述它是"非常明亮、非常丰富、非常大"。M46距离地球大约4,920 光年^[1]，估计有约500颗恒星，总质量大约是7032900813150000000♠453 M_☉^[2]，年龄大约是2亿5120万年^[1]。

星团的潮汐半径是37.8 ± 4.6 ly（11.6 ± 1.4 pc），核半径是8.5 ± 1.3 ly（2.6 ± 0.4 pc）^[2]。它在红外空间上比可见光有更大的空间扩展，表明这个星团正在经历一些质量区隔，较黯淡（较红）的恒星迁移至晕区。由于过去的交互作用，向南和西南延伸的黯淡恒星可能会形成潮汐尾^[4]。

行星状星云 NGC 2438似乎在集团内靠近星团北侧的边缘（影像顶部中心模糊的斑点），但因为径向速度与星团的其他成员不同，因此可能与星团无关^[5]^[6]。这是可能与NGC 2818类似，是一个叠加的范例^[5]^[7]。另一方面，使双极性的葫芦星云发光的恒星与M46有着相同的径向速度和自行，还有相同的距离，因此是这个疏散星团真正的成员^[8]。

M46邻近另一个疏散星团梅西耶 47^[9]。在天球上，M46在M47东方约一度，因此在双筒望远镜或广角的天文望远镜的视野中可以同时看见这两个疏散星团。

参考资料

^ ^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 ^2.3 ^2.4 Piskunov, A. E.; et al, Towards absolute scales for the radii and masses of open clusters, Astronomy and Astrophysics, June 2007, 468 (1): 151–161, Bibcode:2007A&A...468..151P, arXiv:astro-ph/0702517 , doi:10.1051/0004-6361:20077073.
^ M 46. SIMBAD. 斯特拉斯堡天文资料中心.
^ Davidge, T. J., The Open Cluster NGC 2437 (Messier 46), Publications of the Astronomical Society of the Pacific, February 2013, 125 (924): 115–125, Bibcode:2013PASP..125..115D, arXiv:1301.6806 , doi:10.1086/669823
^ ^5.0 ^5.1 Majaess, D. J.; Turner, D.; Lane, D. In Search of Possible Associations between Planetary Nebulae and Open Clusters. Publications of the Astronomical Society of the Pacific. 2007, 119 (862): 1349. Bibcode:2007PASP..119.1349M. arXiv:0710.2900 . doi:10.1086/524414.
^ Kiss, L. L.; Szabó, Gy. M.; Balog, Z.; Parker, Q. A.; et al. AAOmega radial velocities rule out current membership of the planetary nebula NGC 2438 in the open cluster M46. Monthly Notices of the Royal Astronomical Society. 2008, 391 (1): 399–404. Bibcode:2008MNRAS.391..399K. arXiv:0809.0327 . doi:10.1111/j.1365-2966.2008.13899.x.
^ Mermilliod, J.-C.; Clariá, J. J.; Andersen, J.; Piatti, A. E.; et al. Red giants in open clusters. IX. NGC 2324, 2818, 3960 and 6259. Astronomy and Astrophysics. 2001, 375: 30–39. Bibcode:2001A&A...375...30M. CiteSeerX 10.1.1.30.7545 . doi:10.1051/0004-6361:20010845.
^ Vickers S.B.; Frew D.J.; Parker Q.A.; Bojicic I.S. New light on Galactic post-asymptotic giant branch stars - I. First distance catalogue. Monthly Notices of the Royal Astronomical Society. 2015, 447 (2): 1673. Bibcode:2015MNRAS.447.1673V. arXiv:1403.7230 . doi:10.1093/mnras/stu2383.
^ The hot blue stars of messier 47. ScienceDaily. 17 December 2014 [2020-03-25]. （原始内容存档于2017-12-01）.

外部链接

Messier 46, SEDS Messier pages （页面存档备份，存于互联网档案馆）
Messier 46, Amateur Astronomer Image – Waid Obseratory （页面存档备份，存于互联网档案馆）
Dark Atmospheres Photography – M46 w/ NGC 2438 detail （页面存档备份，存于互联网档案馆）
NASA Astronomy Picture of the Day: M46 and NGC 2438: Young and Old (5 March 1999)
NASA Astronomy Picture of the Day: Stars Young and Old (26 March 2009) - featuring M46
NASA Astronomy Picture of the Day: M64 Plus Two (17 April 2015)
WikiSky上关于M46 (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： 07^h 41.8^m 00^s，−14° 49′ 00″

[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.

[Piskunov2007-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 Piskunov, A. E.; et al, Towards absolute scales for the radii and masses of open clusters, Astronomy and Astrophysics, June 2007, 468 (1): 151–161, Bibcode:2007A&A...468..151P, arXiv:astro-ph/0702517 , doi:10.1051/0004-6361:20077073.

[SIMBAD-3] M 46. SIMBAD. 斯特拉斯堡天文资料中心.

[Davidge2013-4] Davidge, T. J., The Open Cluster NGC 2437 (Messier 46), Publications of the Astronomical Society of the Pacific, February 2013, 125 (924): 115–125, Bibcode:2013PASP..125..115D, arXiv:1301.6806 , doi:10.1086/669823

[majaess2007-5] 5.0 ^5.1 Majaess, D. J.; Turner, D.; Lane, D. In Search of Possible Associations between Planetary Nebulae and Open Clusters. Publications of the Astronomical Society of the Pacific. 2007, 119 (862): 1349. Bibcode:2007PASP..119.1349M. arXiv:0710.2900 . doi:10.1086/524414.

[kiss2008-6] Kiss, L. L.; Szabó, Gy. M.; Balog, Z.; Parker, Q. A.; et al. AAOmega radial velocities rule out current membership of the planetary nebula NGC 2438 in the open cluster M46. Monthly Notices of the Royal Astronomical Society. 2008, 391 (1): 399–404. Bibcode:2008MNRAS.391..399K. arXiv:0809.0327 . doi:10.1111/j.1365-2966.2008.13899.x.

[mermilliod2001-7] Mermilliod, J.-C.; Clariá, J. J.; Andersen, J.; Piatti, A. E.; et al. Red giants in open clusters. IX. NGC 2324, 2818, 3960 and 6259. Astronomy and Astrophysics. 2001, 375: 30–39. Bibcode:2001A&A...375...30M. CiteSeerX 10.1.1.30.7545 . doi:10.1051/0004-6361:20010845.

[vickers2015-8] Vickers S.B.; Frew D.J.; Parker Q.A.; Bojicic I.S. New light on Galactic post-asymptotic giant branch stars - I. First distance catalogue. Monthly Notices of the Royal Astronomical Society. 2015, 447 (2): 1673. Bibcode:2015MNRAS.447.1673V. arXiv:1403.7230 . doi:10.1093/mnras/stu2383.

[ScienceDaily-2014-12-17-9] The hot blue stars of messier 47. ScienceDaily. 17 December 2014 [2020-03-25]. （原始内容存档于2017-12-01）.

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相关条目

参考资料

外部链接