Globular cluster in the constellation Delphinus
NGC 6934 (also known asCaldwell 47 ) is aglobular cluster of stars in the northernconstellation ofDelphinus , about 52kilolight-years distant from theSun .[ 3] William Herschel on 24 September 1785.[ 4] eccentricity of 0.81) through theMilky Way along anorbital plane that is inclined by 73° to thegalactic plane . It may share a common dynamic origin withNGC 5466 .[ 6] [ 9]
This appears to be aOosterhoff type I cluster with an intermediatemetallicity .[ 10] Shapley–Sawyer Concentration Class of VIII,[ 1] core radius of[ 3] [ 5] mass of the Sun .[ 7] subgiant branch on theHR diagram .[ 9] variable stars have discovered 85 in the cluster field, of which 79 are of theRR Lyrae class and one is aSX Phe variable .[ 10] tidal tail .[ 11]
^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 Hessels, J. W. T.; et al. (November 2007), "A 1.4 GHz Arecibo Survey for Pulsars in Globular Clusters",The Astrophysical Journal ,670 (1):363– 378,arXiv :0707.1602 Bibcode :2007ApJ...670..363H ,doi :10.1086/521780 ,S2CID 16914232 . ^a b NGC 6934 SEDS , retrieved2010-10-09 ^a b Forbes, Duncan A.; et al. (October 2008)."Uniting old stellar systems: from globular clusters to giant ellipticals" .Monthly Notices of the Royal Astronomical Society .389 (4):1924– 1936.arXiv :0806.1090 Bibcode :2008MNRAS.389.1924F .doi :10.1111/j.1365-2966.2008.13739.x S2CID 14108457 . ^a b Dinescu, Dana I.; et al. (October 2001). "Orbits of Globular Clusters in the Outer Galaxy: NGC 7006".The Astronomical Journal .122 (4):1916– 1927.arXiv :astro-ph/0106259 Bibcode :2001AJ....122.1916D .doi :10.1086/323094 .S2CID 1232455 . ^a b c 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 . ^ "NGC 6934" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2020-10-08 .^a b Marino, A. F.; et al. (June 2018)."Metallicity Variations in the Type II Globular Cluster NGC 6934" .The Astrophysical Journal .859 (2): 20.arXiv :1804.04158 Bibcode :2018ApJ...859...81M .doi :10.3847/1538-4357/aabdea S2CID 119461759 . 81. ^a b Kaluzny, J.; et al. (March 2001). "Image-Subtraction Photometry of Variable Stars in the Field of the Globular Cluster NGC 6934".The Astronomical Journal .121 (3):1533– 1550.arXiv :astro-ph/0010303 Bibcode :2001AJ....121.1533K .doi :10.1086/319411 .S2CID 14431121 . ^ Wilhelm, R.; et al. (December 2002). "Does NGC 6934 Have a Tidal Tail?".Bulletin of the American Astronomical Society .34 : 1101.Bibcode :2002AAS...201.0702W .
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