NGC 3201

NGC 3201
NGC 3201 by Hubble Space Telescope; 3.5′ view Credit: NASA/STScI/WikiSky
Observation data (J2000 epoch)
Class	X^[1]
Constellation	Vela
Right ascension	10^h 17^m 36.82^s^[2]
Declination	–46° 24′ 44.9″^[2]
Distance	16.3 kly (5.0 kpc)^[3]
Apparent magnitude (V)	+8.24^[4]
Apparent dimensions (V)	18′.2
Physical characteristics
Mass	7005254000000000000♠2.54×10⁵^[5] M_☉
Radius	40 ly^[6]
V_HB	14.77
Metallicity	${\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}$ = –1.24^[7] dex
Estimated age	10.24 Gyr^[7]
Other designations	GCl 15,^[4] GC 2068, h 3238, Dun 445, Bennett 44, Caldwell 79^[8]

Colour-composite image of NGC 3201, obtained with the WFI instrument on the ESO/MPG 2.2-m telescope at La Silla Observatory

NGC 3201 is a low galactic latitude globular cluster in the southern constellation of Vela. It has a very low central concentration of stars.^[9] This cluster was discovered by James Dunlop on May 28, 1826 and listed it in his 1827 catalogue. He described it as "a pretty large pretty bright round nebula, 4′ or 5′ diameter, very gradually condensed towards the centre, easily resolved into stars; the figure is rather irregular, and the stars are considerably scattered on the south".^[10]

The radial velocity of this cluster is unusually high at 490 km/s, larger than any other cluster known. This corresponds to a peculiar velocity of 240 km/s. While high, this is lower than the escape velocity of the Milky Way galaxy.^[10] It is located at a distance of 16,300 light years from the Sun and has an estimated 254,000 times the mass of the Sun.^[3] This cluster is about 10.24 billion years old.^[7]

The stellar population of this cluster is inhomogeneous, varying with distance from the core. The effective temperature of the stars shows an increase with greater distance, with the redder and cooler stars tending to be located closer to the core. As of 2010, is one of only two clusters (including Messier 4) that shows a definite inhomogeneous population.^[11]

References

↑ Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin (849): 11–14, Bibcode:1927BHarO.849...11S.
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.
1 2 Paust, Nathaniel E. Q.; et al. (February 2010), "The ACS Survey of Galactic Globular Clusters. VIII. Effects of Environment on Globular Cluster Global Mass Functions", The Astronomical Journal, 139 (2): 476–491, Bibcode:2010AJ....139..476P, doi:10.1088/0004-6256/139/2/476.
1 2 "SIMBAD Astronomical Object Database", Results for NGC 3201, retrieved 2006-11-16.
↑ 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.
↑ distance × sin( diameter_angle / 2 ) = 40 ly. radius
1 2 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, arXiv:1001.4289, Bibcode:2010MNRAS.404.1203F, doi:10.1111/j.1365-2966.2010.16373.x.
↑ "NGC 3201", Deep Sky Observer's Companion, retrieved 2012-04-28.
↑ Webb, N. A.; Wheatley, P. J.; Barret, D. (2005), XMM-Newton X-ray and optical observations of the globular clusters M 55 and NGC 3201, arXiv:astro-ph/0509085, Bibcode:2005yCat..34450155W, doi:10.1051/0004-6361:20053010.
1 2 O'Meara, Stephen James (2002), The Caldwell Objects, Deep-Sky Companions, Cambridge University Press, pp. 314–315, ISBN 0521827965.
↑ Kravtsov, V.; et al. (March 2010), "Evidence of the inhomogeneity of the stellar population in the differentially reddened globular cluster NGC 3201", Astronomy and Astrophysics, 512: L6, arXiv:1004.5583, Bibcode:2010A&A...512L...6K, doi:10.1051/0004-6361/200913749.

External links

Globular Cluster NGC 3201 at SEDS pages

NGC 3201 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
NGC 3201 at DOCdb (Deep Sky Observer's Companion)

Coordinates: 10^h 17^m 36.76^s, −46° 24′ 40.4″

Caldwell catalogue

List	C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68 C69 C70 C71 C72 C73 C74 C75 C76 C77 C78 C79 C80 C81 C82 C83 C84 C85 C86 C87 C88 C89 C90 C91 C92 C93 C94 C95 C96 C97 C98 C99 C100 C101 C102 C103 C104 C105 C106 C107 C108 C109

See also	Messier Catalogue Catalogue of Nebulae and Clusters of Stars New General Catalogue Index Catalogue Revised New General Catalogue Herschel 400 Catalogue

Book:Caldwell catalogue Category:Caldwell objects Portal:Astronomy Commons:Caldwell objects

New General Catalogue 3000 to 3499

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Astronomical catalog List of NGC objects

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