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NGC 6352
Observation data ( J2000 epoch)
ClassXI: [1]
Constellation Ara
Right ascension17h 25m 29.11s [2]
Declination–48° 25′ 19.8″ [2]
Distance18.3  kly (5.6  kpc) [3]
Apparent magnitude (V)+7.8 [4]
Apparent dimensions (V)7.1′ [5]
Physical characteristics
Mass3.7×104 [6]  M☉
Tidal radius10.5″ [7]
Metallicity = –0.70 [8] dex
Estimated age12.67  Gyr [8]
Other designations Caldwell 81, Cr 328, NGC 6352 [9]
See also: Globular cluster, List of globular clusters

NGC 6352 (also known as Caldwell 81) is a globular cluster of stars in the southern constellation of Ara, located approximately 18.3  kly [3] from the Sun. It was discovered by Scottish astronomer James Dunlop on May 14, 1826. [10] The cluster has a Shapley–Sawyer Concentration Class of XI:. [1] A telescope with a 15 cm (5.9 in) aperture is required to resolve the stars within this loose cluster. [4]

This cluster is about 12.67 [8] billion years old with two distinct stellar populations; the second generation is only around 10 million years younger than the first. [3] It lies approximately 13 kly (4 kpc) from the Galactic Center and 1.6 kly (0.5 kpc) from the galactic plane. [11] The orbital motion of this cluster through the Milky Way suggests it is a member of the bulge or disk population. [12] It is relatively metal-rich for an object of this class, [3] having a metallicity of –0.70. [8] The core radius is 49.8″ [3] and the tidal radius is 10.5″. [7]

References

  1. ^ a b 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 c d e Libralato, Mattia; et al. (March 2019), "The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XVIII. Proper-motion Kinematics of Multiple Stellar Populations in the Core Regions of NGC 6352", The Astrophysical Journal, 873 (2): 12, arXiv: 1902.02787, Bibcode: 2019ApJ...873..109L, doi: 10.3847/1538-4357/ab0551, S2CID  119222605, 109.
  4. ^ a b Dunlop, Storm (2005). Atlas of the Night Sky. HarperCollins. ISBN  978-0-00-717223-8.
  5. ^ O'Meara, Stephen James (2002). Deep Sky Companions: The Caldwell Objects. Cambridge University Press. p. 324. ISBN  0-521-82796-5.
  6. ^ Marks, Michael; Kroupa, Pavel (August 2010), "Initial conditions for globular clusters and assembly of the old globular cluster population of the Milky Way", Monthly Notices of the Royal Astronomical Society, 406 (3): 2000–2012, arXiv: 1004.2255, Bibcode: 2010MNRAS.406.2000M, doi: 10.1111/j.1365-2966.2010.16813.x, S2CID  118652005. Mass is from MPD on Table 1.
  7. ^ a b Johnston, H. M.; et al. (May 1996), "ROSAT observations of ten globular clusters with large core radii.", Astronomy and Astrophysics, 309: 116–122, Bibcode: 1996A&A...309..116J.
  8. ^ a b c d 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.
  9. ^ "NGC 6352". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-26.
  10. ^ Seligman, Courtney. "New General Catalogue objects: NGC 6350 - 6399". cseligman.com. Retrieved 2020-09-20.
  11. ^ Fullton, L. K.; et al. (August 1995), "A VIC Color-Magnitude Diagram of the Globular Cluster NGC 6352 From Hubble Space Telescope Planetary Camera Observations", Astronomical Journal, 110: 652, Bibcode: 1995AJ....110..652F, doi: 10.1086/117552.
  12. ^ Wagner-Kaiser, R.; et al. (July 2016). "Bayesian Analysis of Two Stellar Populations in Galactic Globular Clusters. II. NGC 5024, NGC 5272, and NGC 6352". The Astrophysical Journal. 826 (1): 18. arXiv: 1604.06074. Bibcode: 2016ApJ...826...42W. doi: 10.3847/0004-637X/826/1/42. S2CID  119244229. 42.

External links

  • Media related to NGC 6352 at Wikimedia Commons
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