NGC 5986

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NGC 5986
NGC 5986 Hubble WikiSky.jpg
NGC 5986 by Hubble Space Telescope; 3.5′ view
Observation data (J2000 epoch)
Class VII [1]
Constellation Lupus
Right ascension 15h 46m 03.00s [2]
Declination –37° 47′ 11.1″ [2]
Distance 33.9  kly (10.4  kpc) [3]
Apparent magnitude (V)8.0
Apparent dimensions (V)5'
Physical characteristics
Absolute magnitude −8.44 [4]
Mass5.99×105 [3]   M☉
Metallicity  = −1.35 [5] dex
Estimated age12.16  Gyr [5]
Other designationsESO 329-SC 018, NGC 5986 [6] [7]
See also: Globular cluster, List of globular clusters

NGC 5986 is a globular cluster of stars in the southern constellation of Lupus, located at a distance of approximately 34 kilolight-years from the Sun. [3] It was discovered by Scottish astronomer James Dunlop on May 10, 1826. John L. E. Dreyer described it as, "a remarkable object, a globular cluster, very bright, large, round, very gradually brighter middle, stars of 13th to 15th magnitude". [8] Its prograde–retrograde orbit through the Milky Way galaxy is considered irregular and highly eccentric. It has a mean heliocentric radial velocity of +100 km/s. [4] The galacto-centric distance is 17  kly (5.2  kpc ), which puts it in the galaxy's inner halo. [9]

Contents

This is relatively massive cluster has been poorly studied, at least as of 2017. [4] It is moderately concentrated, with a core radius of 28.2″ and a projected half-light radius of 58.8″. The three dimensional half-mass radius is ~78.16″. [10] The cluster has a higher metallicity – what astronomers term the abundance of elements with higher atomic number then helium – compared to most other objects of its type. [11] It may have at least 4–5 different stellar populations with distinct elemental compositions, and there is evidence that it has lost ~60–80% of its original mass. [4]

Further reading

Related Research Articles

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<span class="mw-page-title-main">Messier 62</span> Globular cluster in the constellation Ophiuchus

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<span class="mw-page-title-main">NGC 4833</span> Globular cluster in the constellation Musca

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<span class="mw-page-title-main">NGC 1261</span> Globular cluster in the constellation Horologium

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<span class="mw-page-title-main">NGC 6352</span> Globular cluster in the constellation Ara

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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. 1 2 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. 1 2 3 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. 1 2 3 4 Johnson, Christian I.; et al. (June 2017). "Chemical Complexity in the Eu-enhanced Monometallic Globular NGC 5986". The Astrophysical Journal. 842 (1): 21. arXiv: 1705.10840 . Bibcode:2017ApJ...842...24J. doi: 10.3847/1538-4357/aa7414 . S2CID   119279995. 24.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  5. 1 2 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. ↑ "NASA/IPAC Extragalactic Database". Results for NGC 5986. Retrieved 2007-04-06.
  7. ↑ "NGC 5986". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-02-25.
  8. ↑ Seligman, Courtney. "New General Catalogue objects: NGC 5950 - 5999". cseligman.com. Retrieved 2020-09-20.
  9. ↑ Ortolani, S.; et al. (October 2000). "Colour-magnitude diagrams of the inner halo globular clusters NGC 5986 and NGC 6712". Astronomy and Astrophysics. 362: 953–958. Bibcode:2000A&A...362..953O.
  10. ↑ Lanzoni, B.; et al. (September 2018), "The ESO Multi-instrument Kinematic Survey (MIKiS) of Galactic Globular Clusters: Solid-body Rotation and Anomalous Velocity Dispersion Profile in NGC 5986", The Astrophysical Journal, 865 (1): 9, arXiv: 1808.01194 , Bibcode:2018ApJ...865...11L, doi: 10.3847/1538-4357/aad810 , S2CID   119414659, 11.
  11. ↑ Moni Bidin, C.; et al. (May 2009). "A lack of close binaries among hot horizontal branch stars in globular clusters. M 80 and NGC 5986". Astronomy and Astrophysics. 498 (3): 737–751. arXiv: 0903.2072 . Bibcode:2009A&A...498..737M. doi:10.1051/0004-6361/200810579. S2CID   16080323.
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