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Messier 56

January 01, 1970

Messier 56 (also known as M56 or NGC 6779) is a globular cluster in the constellation Lyra.[a] It was discovered by Charles Messier in 1779.[b] It is angularly found about midway between Albireo (Beta (β) Cygni) and Sulafat (Gamma (γ) Lyrae). In a good night sky it is tricky to find with large (50–80 mm) binoculars, appearing as a slightly fuzzy star.[9] The cluster can be resolved using a telescope with an aperture of 8 in (20 cm) or larger.[10]

Messier 56
Messier 56 by Hubble Space Telescope. 3.6′ view
Observation data (J2000 epoch)
ClassX[1]
ConstellationLyra
Right ascension19h 16m 35.57s[2]
Declination+30° 11′ 00.5″[2]
Distance32.9 kly (10.1 kpc)[3]
Apparent magnitude (V)8.3[4]
Apparent dimensions (V)8.8'[4]
Physical characteristics
Mass2.30×105[5] M☉
Radius42 ly[6]
Metallicity = –2.00[7] dex
Estimated age13.70 Gyr[7]
Other designationsM56, NGC 6779, GCl 110, C 1914+300[8]
See also: Globular cluster, List of globular clusters

M56 is about 32,900 light-years away from Earth[3] and measures roughly 84 light-years across, containing 230,000[5] solar masses (M☉). It is about 31–32 kly (9.5–9.8 kpc) from the Galactic Center and 4.8 kly (1.5 kpc) above the galactic plane.[11] This cluster has an estimated age of 13.70 billion years and is following a retrograde orbit through the Milky Way. The properties of this cluster suggest that it may have been acquired during the merger of a dwarf galaxy, of which Omega Centauri forms the surviving nucleus. For Messier 56, the abundance of elements other than hydrogen and helium, what astronomers term the metallicity, has a very low value of [Fe/H] = –2.00 dex which is 1⁄100 of the abundance in the Sun.[7]

The brightest stars in M56 are of 13th magnitude, while it contains only about a dozen known variable stars, such as V6 (RV Tauri star; period: 90 days) or V1 (Cepheid: 1.510 days);[12] other variable stars are V2 (irregular) and V3 (semiregular). In 2000, a diffuse X-ray emission was tentatively identified coming from the vicinity of the cluster. This is most likely interstellar medium that has been heated by the passage of the cluster through the galactic halo. The relative velocity of the cluster is about 177 km s−1, which is sufficient to heat the medium in its wake to a temperature of 940,000 K.[13]

M56 is part of the Gaia Sausage, the hypothesised remains of a merged dwarf galaxy.[14]

Gallery edit

  •  
    Messier 56 - wide field view
  •  
    Map showing location of M56 (Roberto Mura)

See also edit

References and footnotes edit

  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. ^ 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 Ivanov, Valentin D.; et al. (2000). "Near Infrared Photometry of Galactic Globular Clusters M56 and M15. Extending the Red Giant Branch vs. Metallicity Calibration Towards Metal Poor Systems". arXiv:astro-ph/0002118.
  4. ^ a b "Messier 56". SEDS Messier Catalog. Retrieved 29 April 2022.
  5. ^ a b 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.
  6. ^ From trigonometry: radius = distance × sin( diameter_angle / 2 ) = 32,900 × sin(8.8′/2) = 42.1 ly.
  7. ^ a b c 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
  8. ^ "M 56". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2006-11-16.
  9. ^ Thompson, Robert Bruce; Thompson, Barbara Fritchman (2007), Illustrated guide to astronomical wonders, DIY science, O'Reilly Media, Inc., p. 311, ISBN 978-0-596-52685-6
  10. ^ Inglis, Mike (2004), Astronomy of the Milky Way: Observer's guide to the northern sky, vol. 1, Springer, p. 90, Bibcode:2003amwn.book.....I, ISBN 978-1-85233-709-4
  11. ^ Bica, E.; et al. (April 2006), "Globular cluster system and Milky Way properties revisited", Astronomy and Astrophysics, 450 (1): 105–115, arXiv:astro-ph/0511788, Bibcode:2006A&A...450..105B, doi:10.1051/0004-6361:20054351, S2CID 1559058
  12. ^ Pietrukowicz, P.; et al. (June 2008), "CURiuos Variables Experiment (CURVE): Variable Stars in the Metal-Poor Globular Cluster M56", Acta Astronomica, 58: 121–130, arXiv:0806.1515, Bibcode:2008AcA....58..121P
  13. ^ Hopwood, M. E. L.; et al. (July 2000), "A possible detection of diffuse extended X-ray emission in the environment of the globular cluster NGC 6779", Monthly Notices of the Royal Astronomical Society, 316 (1): L5–L8, Bibcode:2000MNRAS.316L...5H, doi:10.1046/j.1365-8711.2000.03717.x
  14. ^ Myeong, G. C; Evans, N. W; Belokurov, V; Sanders, J. L; Koposov, S. E (2018). "The Sausage Globular Clusters". The Astrophysical Journal. 863 (2): L28. arXiv:1805.00453. Bibcode:2018ApJ...863L..28M. doi:10.3847/2041-8213/aad7f7. S2CID 67791285.
  1. ^ Specifically in the center-northwest of Lyra which makes it visible from everywhere above about the 50th parallel south. However the Sun passes through Sagittarius far to the south (or technically the Earth orbits so as to make the Sun seem to do so) throughout December. This also makes the cluster mostly risen during day, not night, in the nearest months but will never impede pre-dawn and post-sunset views from the upper half of northerly latitudes.
  2. ^ on January 19

External links edit

 
Wikimedia Commons has media related to Messier 56.
  • Messier 56, SEDS Messier pages
  • Messier 56, Galactic Globular Clusters Database page
  • Hubble snaps a collection of ancient stars, August 26, 2012, TG Daily
  • Crowther, Paul; Szymanek, Nik; Merrifield, Mike. "M56 – Globular Cluster". Deep Sky Videos. Brady Haran.
  • Messier 56 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images


January 01, 1970
messier, also, known, 6779, globular, cluster, constellation, lyra, discovered, charles, messier, 1779, angularly, found, about, midway, between, albireo, beta, cygni, sulafat, gamma, lyrae, good, night, tricky, find, with, large, binoculars, appearing, slight. Messier 56 also known as M56 or NGC 6779 is a globular cluster in the constellation Lyra a It was discovered by Charles Messier in 1779 b It is angularly found about midway between Albireo Beta b Cygni and Sulafat Gamma g Lyrae In a good night sky it is tricky to find with large 50 80 mm binoculars appearing as a slightly fuzzy star 9 The cluster can be resolved using a telescope with an aperture of 8 in 20 cm or larger 10 Messier 56Messier 56 by Hubble Space Telescope 3 6 viewObservation data J2000 epoch ClassX 1 ConstellationLyraRight ascension19h 16m 35 57s 2 Declination 30 11 00 5 2 Distance32 9 kly 10 1 kpc 3 Apparent magnitude V 8 3 4 Apparent dimensions V 8 8 4 Physical characteristicsMass2 30 105 5 M Radius42 ly 6 Metallicity Fe H displaystyle begin smallmatrix left ce Fe ce H right end smallmatrix 2 00 7 dexEstimated age13 70 Gyr 7 Other designationsM56 NGC 6779 GCl 110 C 1914 300 8 See also Globular cluster List of globular clusters M56 is about 32 900 light years away from Earth 3 and measures roughly 84 light years across containing 230 000 5 solar masses M It is about 31 32 kly 9 5 9 8 kpc from the Galactic Center and 4 8 kly 1 5 kpc above the galactic plane 11 This cluster has an estimated age of 13 70 billion years and is following a retrograde orbit through the Milky Way The properties of this cluster suggest that it may have been acquired during the merger of a dwarf galaxy of which Omega Centauri forms the surviving nucleus For Messier 56 the abundance of elements other than hydrogen and helium what astronomers term the metallicity has a very low value of Fe H 2 00 dex which is 1 100 of the abundance in the Sun 7 The brightest stars in M56 are of 13th magnitude while it contains only about a dozen known variable stars such as V6 RV Tauri star period 90 days or V1 Cepheid 1 510 days 12 other variable stars are V2 irregular and V3 semiregular In 2000 a diffuse X ray emission was tentatively identified coming from the vicinity of the cluster This is most likely interstellar medium that has been heated by the passage of the cluster through the galactic halo The relative velocity of the cluster is about 177 km s 1 which is sufficient to heat the medium in its wake to a temperature of 940 000 K 13 M56 is part of the Gaia Sausage the hypothesised remains of a merged dwarf galaxy 14 Contents 1 Gallery 2 See also 3 References and footnotes 4 External linksGallery edit nbsp Messier 56 wide field view nbsp Map showing location of M56 Roberto Mura See also editList of Messier objectsReferences and footnotes edit 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 Ivanov Valentin D et al 2000 Near Infrared Photometry of Galactic Globular Clusters M56 and M15 Extending the Red Giant Branch vs Metallicity Calibration Towards Metal Poor Systems arXiv astro ph 0002118 a b Messier 56 SEDS Messier Catalog Retrieved 29 April 2022 a b 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 From trigonometry radius distance sin diameter angle 2 32 900 sin 8 8 2 42 1 ly a b c 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 M 56 SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2006 11 16 Thompson Robert Bruce Thompson Barbara Fritchman 2007 Illustrated guide to astronomical wonders DIY science O Reilly Media Inc p 311 ISBN 978 0 596 52685 6 Inglis Mike 2004 Astronomy of the Milky Way Observer s guide to the northern sky vol 1 Springer p 90 Bibcode 2003amwn book I ISBN 978 1 85233 709 4 Bica E et al April 2006 Globular cluster system and Milky Way properties revisited Astronomy and Astrophysics 450 1 105 115 arXiv astro ph 0511788 Bibcode 2006A amp A 450 105B doi 10 1051 0004 6361 20054351 S2CID 1559058 Pietrukowicz P et al June 2008 CURiuos Variables Experiment CURVE Variable Stars in the Metal Poor Globular Cluster M56 Acta Astronomica 58 121 130 arXiv 0806 1515 Bibcode 2008AcA 58 121P Hopwood M E L et al July 2000 A possible detection of diffuse extended X ray emission in the environment of the globular cluster NGC 6779 Monthly Notices of the Royal Astronomical Society 316 1 L5 L8 Bibcode 2000MNRAS 316L 5H doi 10 1046 j 1365 8711 2000 03717 x Myeong G C Evans N W Belokurov V Sanders J L Koposov S E 2018 The Sausage Globular Clusters The Astrophysical Journal 863 2 L28 arXiv 1805 00453 Bibcode 2018ApJ 863L 28M doi 10 3847 2041 8213 aad7f7 S2CID 67791285 Specifically in the center northwest of Lyra which makes it visible from everywhere above about the 50th parallel south However the Sun passes through Sagittarius far to the south or technically the Earth orbits so as to make the Sun seem to do so throughout December This also makes the cluster mostly risen during day not night in the nearest months but will never impede pre dawn and post sunset views from the upper half of northerly latitudes on January 19External links edit nbsp Wikimedia Commons has media related to Messier 56 Messier 56 SEDS Messier pages Messier 56 Galactic Globular Clusters Database page Hubble snaps a collection of ancient stars August 26 2012 TG Daily Crowther Paul Szymanek Nik Merrifield Mike M56 Globular Cluster Deep Sky Videos Brady Haran Messier 56 on WikiSky DSS2 SDSS GALEX IRAS Hydrogen a X Ray Astrophoto Sky Map Articles and images Portals nbsp Astronomy nbsp Stars nbsp Outer space Retrieved from https en wikipedia org w index php title Messier 56 amp oldid 1192594401, wikipedia, wiki, book, books, library,

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