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NGC 6352

August 25, 2023

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]

NGC 6352
Observation data (J2000 epoch)
ClassXI:[1]
ConstellationAra
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 designationsCaldwell 81, Cr 328, NGC 6352[9]
See also: Globular cluster, List of globular clusters

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 Edit

  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. 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 Edit

  •   Media related to NGC 6352 at Wikimedia Commons

August 25, 2023
6352, also, known, caldwell, globular, cluster, stars, southern, constellation, located, approximately, from, discovered, scottish, astronomer, james, dunlop, 1826, cluster, shapley, sawyer, concentration, class, telescope, with, aperture, required, resolve, s. 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 NGC 6352Observation data J2000 epoch ClassXI 1 ConstellationAraRight 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 characteristicsMass3 7 104 6 M Tidal radius10 5 7 Metallicity Fe H displaystyle begin smallmatrix left ce Fe ce H right end smallmatrix 0 70 8 dexEstimated age12 67 Gyr 8 Other designationsCaldwell 81 Cr 328 NGC 6352 9 See also Globular cluster List of globular clustersThis 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 Edit 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 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 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 a b Dunlop Storm 2005 Atlas of the Night Sky HarperCollins ISBN 978 0 00 717223 8 O Meara Stephen James 2002 Deep Sky Companions The Caldwell Objects p 324 ISBN 0 521 82796 5 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 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 amp A 309 116J 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 NGC 6352 SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2020 02 26 Seligman Courtney New General Catalogue objects NGC 6350 6399 cseligman com Retrieved 2020 09 20 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 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 Edit Media related to NGC 6352 at Wikimedia Commons Retrieved from https en wikipedia org w index php title NGC 6352 amp oldid 1170905808, wikipedia, wiki, book, books, library,

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