NGC 6723

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

NGC 6723, also known as the Chandelier Cluster,[6] is a globular cluster[7] 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.

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.[8]

Map showing location of NGC 6723

References

  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. ^ Stoyan, Ronald; Schurig, Stephan (2014). interstellarum Deep Sky Atlas. Erlangen: Cambridge University Press; Oculum-Verlag GmbH. ISBN 978-1-107-50338-0. OCLC 920437579.
  7. ^ "SIMBAD Astronomical Object Database". Results for NGC 6723. Retrieved 2007-04-21.
  8. ^ 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



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