Astronomy:NGC 6352

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Short description: Globular cluster in the constellation Ara
NGC 6352
NGC 6352.jpg
Observation data (J2000 epoch)
ClassXI:[1]
ConstellationAra
Right ascension 17h 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[math]\displaystyle{ \begin{smallmatrix}\left[\ce{Fe}/\ce{H}\right]\end{smallmatrix} }[/math] = –0.70[8] dex
Estimated age12.67 Gyr[8]
Other designationsCaldwell 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. 1.0 1.1 Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin 849 (849): 11–14, Bibcode1927BHarO.849...11S. 
  2. 2.0 2.1 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, doi:10.1088/0004-6256/140/6/1830, Bibcode2010AJ....140.1830G. 
  3. 3.0 3.1 3.2 3.3 3.4 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, doi:10.3847/1538-4357/ab0551, 109, Bibcode2019ApJ...873..109L. 
  4. 4.0 4.1 Dunlop, Storm (2005). Atlas of the Night Sky. Harper Collins. ISBN 978-0-00-717223-8. https://archive.org/details/collinsatlasofni0000dunl. 
  5. O'Meara, Stephen James. Deep Sky Companions: The Caldwell Objects. 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, doi:10.1111/j.1365-2966.2010.16813.x, Bibcode2010MNRAS.406.2000M.  Mass is from MPD on Table 1.
  7. 7.0 7.1 Johnston, H. M. et al. (May 1996), "ROSAT observations of ten globular clusters with large core radii.", Astronomy and Astrophysics 309: 116–122, Bibcode1996A&A...309..116J. 
  8. 8.0 8.1 8.2 8.3 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, doi:10.1111/j.1365-2966.2010.16373.x, Bibcode2010MNRAS.404.1203F. 
  9. "NGC 6352". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6352. 
  10. Seligman, Courtney. "New General Catalogue objects: NGC 6350 - 6399". https://cseligman.com/text/atlas/ngc63a.htm#6352. 
  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, doi:10.1086/117552, Bibcode1995AJ....110..652F. 
  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. doi:10.3847/0004-637X/826/1/42. 42. Bibcode2016ApJ...826...42W. 

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