IC 4651

IC 4651
IC 4651
	Wide Field Imager (WFI) camera拍攝到的疏散星團IC 4651，利用歐洲南方天文台在智利拉西亞天文台的MPG/ESO 2.2米望遠鏡。
觀測數據 (J2000 曆元)
星座	天壇座
赤經	17h 24m 49s
赤緯	−49° 56′ 00″
距離	2,900 ly (888 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是一個位於天壇座，距離地球約2900光年的疏散星團，最早由約翰·路易斯·埃米爾·德雷爾在他的1895年版NGC天體表中記錄^[4]。

IC 4651的年齡大約為1.2±0.2億年，屬於中等年齡的星團^[5]。與太陽相比，該星團中的恆星具有更高的化學元素豐度（氫和氦除外）^[6]。

IC 4651中活動恆星的總質量約為630個太陽質量^[7]。目前已知的活動恆星的質量只佔星團初始質量的約7%。剩餘質量中約35%演化成了白矮星或其他緻密星。其餘丟失質量組成的恆星星已經離開了星團主體或完全離開星團^[7]。

參考資料

^ Sibling Stars. [19 August 2015]. （原始內容存檔於2017-12-27）.
^ ^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.
^ 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 （頁面存檔備份，存於互聯網檔案館）.
^ 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.
^ Biazzo, K.; et al. 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.
^ Pasquini, L.; et al. 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 ${\begin{smallmatrix}\left[{\frac {Fe}{H}}\right]\ =\ +0.10\ \pm \ 0.03\end{smallmatrix}}$ , which is equivalent to 125% of the Sun's abundance of Iron.
^ ^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.

[1] Sibling Stars. [19 August 2015]. （原始內容存檔於2017-12-27）.

[apj619-2] 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.

[aaa389-3] 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 （頁面存檔備份，存於互聯網檔案館）.

[mras51-4] 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.

[aaa475-5] Biazzo, K.; et al. 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.

[aaa424-6] Pasquini, L.; et al. 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 ${\begin{smallmatrix}\left[{\frac {Fe}{H}}\right]\ =\ +0.10\ \pm \ 0.03\end{smallmatrix}}$ , which is equivalent to 125% of the Sun's abundance of Iron.

[aaa386-7] 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.

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