NGC 6723是在人馬座的一個球狀星團[6],位置在靠近南冕座的交界處。它的視星等在6至6.8等,直徑在7和11弧分,在夏普力-索耶集中度分類法的類型為VII,星團中的恆星星等為14等。

NGC 6723
哈伯太空望遠鏡拍攝的NGC 6723;視場3.5
觀測數據(J2000 曆元)
分類VII[1]
星座人馬座
赤經18h 59m 33.15s[2]
赤緯–36° 37′ 56.1″[2]
距離28.4 kly(8.7 kpc[3]
視星等 (V)6.8[4]
視直徑(V)11[4]
物理性質
Mass3.57×105[3] M
金屬量–0.96[5] dex
估計年齡13.06 Gyr[5]

與常見的球狀星團不同,NGC 6723具有較高的金屬量和大量年輕恆星,原始恆星僅佔總數的0.363+0.017
%[7]

標示出NGC 6723位置的星圖。

參考資料

  1. ^ Shapley, Harlow; Sawyer, Helen B., A Classification of Globular Clusters, Harvard College Observatory Bulletin, August 1927, 849 (849): 11–14, Bibcode:1927BHarO.849...11S. 
  2. ^ 2.0 2.1 Goldsbury, Ryan; et al, The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters, The Astronomical Journal, December 2010, 140 (6): 1830–1837, Bibcode:2010AJ....140.1830G, S2CID 119183070, arXiv:1008.2755 , doi:10.1088/0004-6256/140/6/1830. 
  3. ^ 3.0 3.1 Boyles, J.; et al, Young Radio Pulsars in Galactic Globular Clusters, The Astrophysical Journal, November 2011, 742 (1): 51, Bibcode:2011ApJ...742...51B, S2CID 118649860, arXiv:1108.4402 , doi:10.1088/0004-637X/742/1/51. 
  4. ^ 4.0 4.1 Data for NGC 6723. NGC/IC Project. [19 November 2013]. (原始內容存檔於15 January 2013). 
  5. ^ 5.0 5.1 Forbes, Duncan A.; Bridges, Terry, Accreted versus in situ Milky Way globular clusters, Monthly Notices of the Royal Astronomical Society, May 2010, 404 (3): 1203–1214, Bibcode:2010MNRAS.404.1203F, S2CID 51825384, arXiv:1001.4289 , doi:10.1111/j.1365-2966.2010.16373.x. 
  6. ^ SIMBAD Astronomical Object Database. Results for NGC 6723. [2007-04-21]. (原始內容存檔於2019-05-01). 
  7. ^ Lee, Jae-Woo, Multiple Stellar Populations of Globular Clusters from Homogeneous Ca–CN–CH Photometry. V. cnJWL as a Surrogate cnJWL Index and NGC 6723, The Astrophysical Journal, 2019, 883 (2): 166, S2CID 201070324, arXiv:1908.06670 , doi:10.3847/1538-4357/ab3d34 
  • Robert Burnham Jr, Burnham's Celestial Handbook: An observer's guide to the universe beyond the solar system, vol 3, p. 1558

外部連結