IC 4651

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IC 4651
The rich star cluster IC 4651
Wide Field Imager (WFI) camera拍摄到的疏散星团IC 4651,利用欧洲南方天文台智利拉西亚天文台英语La Silla Observatory的MPG/ESO 2.2米望远镜。[1]
觀測數據 (J2000 曆元)
星座 天坛座
赤經 17h 24m 49s[2]
赤緯 −49° 56′ 00″[2]
距離 2,900 ly (888[3] pc)
視直徑 (V) 10.0' (角分)
物理性質
其他名稱(標示) Melotte 169
相關條目:疏散星團疏散星團列表

IC 4651是一个位于天坛座,距离地球约2900光年的疏散星团,最早由约翰·路易斯·埃米尔·德雷尔在他的1895年版NGC天体表中记录[4]

IC 4651的年龄大约为1.2±0.2亿年,属于中等年龄的星团[5]。 与太阳相比,该星团中的恒星具有更高的化学元素丰度除外)[6]

IC 4651中活动恒星的总质量约为630个太阳质量[7]。目前已知的活动恒星的质量只占星团初始质量的约7%。剩余质量中约35%演化成了白矮星或其他致密星。其余丢失质量组成的恒星星已经离开了星团主体或完全离开星团[7]

参考资料[编辑]

  1. ^ Sibling Stars. [19 August 2015]. 
  2. ^ 2.0 2.1 Xin, Y.; Deng, L. Blue Stragglers in Galactic Open Clusters and Integrated Spectral Energy Distributions. The Astrophysical Journal. February 2005, 619 (2): 824–838. Bibcode:2005ApJ...619..824X. arXiv:astro-ph/0410325. doi:10.1086/426681. 
  3. ^ Dias, W.S.; Alessi, B.S.; Moitinho, A.; Lepine. J.R.D. New catalog of optically visible open clusters and candidates. Astronomy and Astrophysics. July 2002, 389: 871–873. Bibcode:2002A&A...389..871D. arXiv:astro-ph/0203351. doi:10.1051/0004-6361:20020668.  Note: see the VizieR catalogue B/ocl.
  4. ^ Dreyer, J. L. E. Index Catalogue of Nebulae found in the years 1888 to 1894, with Notes and Corrections to the New General Catalogue. Memoirs of the Royal Astronomical Society. 1895, 51: 185–228. Bibcode:1895MmRAS..51..185D. 
  5. ^ Biazzo, K.; 等. Deriving temperature, mass, and age of evolved stars from high-resolution spectra. Application to field stars and the open cluster IC 4651. Astronomy and Astrophysics. December 2007, 475 (3): 981–989. Bibcode:2007A&A...475..981B. arXiv:0704.3192. doi:10.1051/0004-6361:20077374. 
  6. ^ Pasquini, L.; 等. Detailed chemical composition of the open cluster IC 4651: The iron peak, α elements, and Li. Astronomy and Astrophysics. September 2004, 424: 951–963. Bibcode:2004A&A...424..951P. arXiv:astro-ph/0406113. doi:10.1051/0004-6361:20040240.  This source gives a metallicity value of , which is equivalent to 125% of the Sun's abundance of Iron.
  7. ^ 7.0 7.1 Meibom, S.; Andersen, J.; Nordström, B. Critical tests of stellar evolution in open clusters. III. Stellar population and dynamical evolution of IC 4651. Astronomy and Astrophysics. April 2002, 386: 187–203. Bibcode:2002A&A...386..187M. doi:10.1051/0004-6361:20020183.