M25 (疏散星團)

M25
M25
	在人馬座的疏散星團M25
觀測資料 (J2000.0 曆元)
赤經	18h 31m 47.0s
赤緯	−19° 07′ 00″
距離	2,000 ly（620 pc）
視星等 (V)	4.9
視大小 (V)	36′
物理特徵
質量	1,937 M☉ M☉
半徑	6.5光年
估計年齡	67.6 million years
其他特徵	M 25、IC 4725、 Cr 382, C 1828–192, Mel 204
	相關條目：疏散星团、NGC天體表

M25，也稱為IC 4725，是一個由恆星組成，在南天人馬座的疏散星團。Philippe Loys de Chéseaux（英语：Philippe Loys de Chéseaux）在1745年對這個星團進行了第一次有記錄的觀測，查爾斯·梅西耶1764年將它收錄進他的星雲天體清單^[6]。這個星團位於模糊的特徵附近，因此有一條暗帶通過中心附近^[3]。

M25距離地球大約2,000光年光年，年齡約為6,760萬歲^[2]。這個星團在空間的維度大約是13光年，估計質量是7033385182135000000♠1,937 M_☉，其中大約24%是星際物質^[4]。星團成員中的人馬座U是一顆分類為造父變星的變星^[7]，還有兩顆紅巨星，且其中一顆是聯星系統^[8]。

參考資料

^ ^1.0 ^1.1 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 ^2.2 ^2.3 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.
^ ^3.0 ^3.1 Landolt, Arlo U., The Galactic Cluster M25, Astrophysical Journal Supplement, February 1964, 8: 352, Bibcode:1964ApJS....8..352L, doi:10.1086/190093.
^ ^4.0 ^4.1 ^4.2 Tadross, A. L.; Marie, M. A.; Osman, A. I.; Hassan, S. M., Astrometry of the Open Cluster M25, Astrophysics and Space Science, 2002, 282 (4): 607–623, Bibcode:2002Ap&SS.282..607T, S2CID 117960833, doi:10.1023/A:1021137115870.
^ IC 4725. SIMBAD. 斯特拉斯堡天文資料中心.
^ Thompson, Robert; Thompson, Barbara, Illustrated Guide to Astronomical Wonders: From Novice to Master Observer, DIY science, O'Reilly Media, Inc.: 408, 2007 [2021-08-20], ISBN 978-0596526856, （原始内容存档于2023-07-28）.
^ Wampler, J.; et al, Cepheids in Galactic Clusters. VIII. a Reinvestigation of U SGR in M25 (= IC 4725), Astrophysical Journal, May 1961, 133: 895, Bibcode:1961ApJ...133..895W, doi:10.1086/147092.
^ Mermilliod, J. C.; et al, Membership of cepheids and red giants in 8 open clusters : NGC 129, 6067, 6087, 6649, 6664, IC 4725, LY 6, RU 79, Astronomy and Astrophysics Supplement Series, September 1987, 70: 389–407, Bibcode:1987A&AS...70..389M.

外部連結

维基共享资源上的相關多媒體資源：M25
Messier 25 （页面存档备份，存于互联网档案馆）, The Messier Catalog. Students for the Exploration and Development of Space (SEDS)
WikiSky上关于M25 (疏散星團)的内容：DSS2, SDSS, GALEX, IRAS, 氢α, X射线, 天文照片, 天图, 文章和图片
Open Cluster M25 （页面存档备份，存于互联网档案馆）. Astronomy Picture of the Day 2009 August 31

[Wu2009-1] 1.0 ^1.1 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 ^2.2 ^2.3 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.

[Landolt1964-3] 3.0 ^3.1 Landolt, Arlo U., The Galactic Cluster M25, Astrophysical Journal Supplement, February 1964, 8: 352, Bibcode:1964ApJS....8..352L, doi:10.1086/190093.

[Tadross2002-4] 4.0 ^4.1 ^4.2 Tadross, A. L.; Marie, M. A.; Osman, A. I.; Hassan, S. M., Astrometry of the Open Cluster M25, Astrophysics and Space Science, 2002, 282 (4): 607–623, Bibcode:2002Ap&SS.282..607T, S2CID 117960833, doi:10.1023/A:1021137115870.

[SIMBAD-5] IC 4725. SIMBAD. 斯特拉斯堡天文資料中心.

[Thompson2007-6] Thompson, Robert; Thompson, Barbara, Illustrated Guide to Astronomical Wonders: From Novice to Master Observer, DIY science, O'Reilly Media, Inc.: 408, 2007 [2021-08-20], ISBN 978-0596526856, （原始内容存档于2023-07-28）.

[Wampler1961-7] Wampler, J.; et al, Cepheids in Galactic Clusters. VIII. a Reinvestigation of U SGR in M25 (= IC 4725), Astrophysical Journal, May 1961, 133: 895, Bibcode:1961ApJ...133..895W, doi:10.1086/147092.

[Mermilliod1987-8] Mermilliod, J. C.; et al, Membership of cepheids and red giants in 8 open clusters : NGC 129, 6067, 6087, 6649, 6664, IC 4725, LY 6, RU 79, Astronomy and Astrophysics Supplement Series, September 1987, 70: 389–407, Bibcode:1987A&AS...70..389M.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

相關條目

參考資料

外部連結