M25 (疏散星團)

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[1]
赤緯−19° 07′ 00″[1]
距離2,000 ly（620 pc）[2]
視星等 (V)4.9[3]
視大小 (V)36′[2]
物理特徵
質量1,937 M☉[4] M☉
半徑6.5光年[4]
估計年齡67.6 million years[2]
其他特徵M 25[5]、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]。

相關條目

參考資料

  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 可免费查阅, doi:10.1111/j.1365-2966.2009.15416.x. 
  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 可免费查阅, doi:10.1051/0004-6361:20042523. 
  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. 
  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. 
  5. ^ IC 4725. SIMBAD. 斯特拉斯堡天文資料中心. 
  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）. 
  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. 
  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. 

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