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NGC 6723

Summary

NGC 6723 is a globular cluster[6] in the constellation Sagittarius. Its magnitude is given as between 6 and 6.8, and its diameter is between 7 and 11 arcminutes. It is a class VII cluster with stars of magnitude 14 and dimmer. It is near the border of Sagittarius and Corona Australis.

NGC 6723
NGC 6723 by Hubble Space Telescope; 3.5′ view
Observation data (J2000 epoch)
ClassVII[1]
ConstellationSagittarius
Right ascension18h 59m 33.15s[2]
Declination–36° 37′ 56.1″[2]
Distance28.4 kly (8.7 kpc)[3]
Apparent magnitude (V)6.8[4]
Apparent dimensions (V)11′[4]
Physical characteristics
Mass3.57×105[3] M☉
Metallicity = –0.96[5] dex
Estimated age13.06 Gyr[5]
See also: Globular cluster, List of globular clusters

Unlike common globular clusters, NGC 6723 has an enhanced metallicity and a large fraction of younger stars, with primordial stars accounting for only 0.363±0.017 % of the total.[7]

Map showing location of NGC 6723

References edit

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

External links edit

  •   Media related to NGC 6723 at Wikimedia Commons
  • NGC 6723 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
  • NGC 6723