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M52

M 52
創建者:2MASS/NASA
觀測資料 (J2000 曆元)
星座仙后座
赤經23h 24m 48.0s[1]
赤緯+61° 35′ 36″[1]
距離4.6 kly(1.4 kpc[1]
視星等 (V)5.0
視大小 (V)13.0′[2]
物理特徵
質量1,200 M[3] M
半徑9.5 ly[2]
估計年齡158.5 Myr[1]
其他特徵NGC 7654、Cr 455, C 2322+613, OCl 260[4]
相關條目:疏散星团NGC天體表

M52梅西耶52,也稱為NGC 7654,是在北天仙后座的一個疏散星團。它是查爾斯·梅西耶在1774年9月7日發現的[2]。在地球上,使用雙筒望遠鏡就可以看見這個星團。這個星團的南半部受到消光的影響非常明顯[5]

羅伯特·朱利斯·特朗普勒英语Robert Julius Trumpler在他的特朗普勒分類法將M52分類為 II2r,表示星團低度向中心集中,亮星和暗星的數量相當,而且星數眾多(超過100顆)[6]。後來,改分為I2r,表示向中心高度集中,有密集的核心[5]。 這個星團的核心半徑是2.97 ± 0.46 ly(0.91 ± 0.14 pc),潮汐半徑為42.7 ± 7.2 ly(13.1 ± 2.2 pc)[3]。估計年齡約1.585億年[1],質量約1,200 M.[3]

視星等+8.3的超巨星BD+ 60°2532可能是M52的成員[3]。 其它的成員包括18顆慢脈動B型變星T,其中一顆是盾牌座δ型變星,3顆是劍魚座γ型變星 [7];可能還有3顆Be星 [8]。星團的核心缺乏星際物質,這可能是星團早期歷史有超新星爆炸的結果[5]

參考資料

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  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可免费查阅, doi:10.1111/j.1365-2966.2009.15416.x. 
  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 
  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可免费查阅, doi:10.1051/0004-6361:20065315 
  4. ^ [ M 52] 请检查|url=值 (帮助). SIMBAD. 斯特拉斯堡天文資料中心. 
  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可免费查阅. 
  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可免费查阅. 
  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. 
  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可免费查阅. 

外部連結

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M52
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