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NGC 6712

April 06, 2023

NGC 6712 is a globular cluster that was probably discovered by Le Gentil on July 9, 1749 when investigating the Milky Way star cloud in Aquila. He described it as a "true nebula," in contrast to the open star cluster M11. Independently discovered by William Herschel on June 16, 1784 and cataloged as H I.47; he also first classified it as a round nebula. John Herschel was the first to describe it as a globular star cluster during his observations in the 1830s. The cluster appears to be about 12 billion years old and may have originally have been significantly more massive having undergone significant mass loss due to passes through the galactic disc.[3] For a globular cluster, NGC 6712 is somewhat metal-rich.[6]

NGC 6712
NGC 6712, by HST
Observation data (J2000 epoch)
ClassIX:[1]
ConstellationScutum
Right ascension18h 53m 04.32s[2]
Declination–08° 42′ 21.5″[2]
Distance26.4 kly (8.1 kpc)<[3]
Apparent magnitude (V)+8.69[2]
Apparent dimensions (V)7.2'
Physical characteristics
Mass9.4×104[4] M☉
Metallicity = –0.94[5] dex
Estimated age10.4 Gyr[5]
Other designationsGCl 103,[2] GC 4441
See also: Globular cluster, List of globular clusters

NGC 6712 is home to a "black widow" pulsar named PSR J1853−0842A. Such systems involve an extremely rapidly rotating pulsar, accompanied by a low-mass star or brown dwarf. The high amounts of radiation emitted from the pulsar contributes to the evaporation of the low-mass companion, which has a mass between 0.018 and 0.036 solar masses. Although pulsars rotate more slowly with age, PSR J1853−0842A is accelerating, which would not be possible without it being within a globular cluster.[6]

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. ^ a b c d "SIMBAD Astronomical Database". Results for NGC 6712. Retrieved 2006-11-16.
  3. ^ a b Deras, D; Ferro, A Arellano; Lázaro, C; Fierro, I H Bustos; Calderón, J H; Muneer, S; Sunetra, Giridhar (22 January 2020). "NGC 6712: the variable star population of a tidally disrupted globular cluster". Monthly Notices of the Royal Astronomical Society. 493 (2): 1996–2014. arXiv:2001.08306. doi:10.1093/mnras/staa196.
  4. ^ 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.
  5. ^ a b 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. ^ a b Yan, Zhen; Pan, Zhi-Chen; Ransom, Scott M.; Lorimer, Duncan R.; Qian, Lei; Wang, Pei; Shen, Zhi-Qiang; Li, Di; Jiang, Peng; Luo, Jin-Tao; Liu, Jie; Huang, Zhi-Peng (2021). "An Eclipsing Black Widow Pulsar in NGC 6712". The Astrophysical Journal. 921 (2): 120. arXiv:2109.06754. Bibcode:2021ApJ...921..120Y. doi:10.3847/1538-4357/ac25eb. S2CID 237502882.

External links

  •   Media related to NGC 6712 at Wikimedia Commons
  • NGC 6712 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
  • Simbad
  • Webda
  • NGC 6712


April 06, 2023
6712, globular, cluster, that, probably, discovered, gentil, july, 1749, when, investigating, milky, star, cloud, aquila, described, true, nebula, contrast, open, star, cluster, independently, discovered, william, herschel, june, 1784, cataloged, also, first, . NGC 6712 is a globular cluster that was probably discovered by Le Gentil on July 9 1749 when investigating the Milky Way star cloud in Aquila He described it as a true nebula in contrast to the open star cluster M11 Independently discovered by William Herschel on June 16 1784 and cataloged as H I 47 he also first classified it as a round nebula John Herschel was the first to describe it as a globular star cluster during his observations in the 1830s The cluster appears to be about 12 billion years old and may have originally have been significantly more massive having undergone significant mass loss due to passes through the galactic disc 3 For a globular cluster NGC 6712 is somewhat metal rich 6 NGC 6712NGC 6712 by HSTObservation data J2000 epoch ClassIX 1 ConstellationScutumRight ascension18h 53m 04 32s 2 Declination 08 42 21 5 2 Distance26 4 kly 8 1 kpc lt 3 Apparent magnitude V 8 69 2 Apparent dimensions V 7 2 Physical characteristicsMass9 4 104 4 M Metallicity Fe H displaystyle begin smallmatrix left ce Fe ce H right end smallmatrix 0 94 5 dexEstimated age10 4 Gyr 5 Other designationsGCl 103 2 GC 4441See also Globular cluster List of globular clustersNGC 6712 is home to a black widow pulsar named PSR J1853 0842A Such systems involve an extremely rapidly rotating pulsar accompanied by a low mass star or brown dwarf The high amounts of radiation emitted from the pulsar contributes to the evaporation of the low mass companion which has a mass between 0 018 and 0 036 solar masses Although pulsars rotate more slowly with age PSR J1853 0842A is accelerating which would not be possible without it being within a globular cluster 6 References 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 c d SIMBAD Astronomical Database Results for NGC 6712 Retrieved 2006 11 16 a b Deras D Ferro A Arellano Lazaro C Fierro I H Bustos Calderon J H Muneer S Sunetra Giridhar 22 January 2020 NGC 6712 the variable star population of a tidally disrupted globular cluster Monthly Notices of the Royal Astronomical Society 493 2 1996 2014 arXiv 2001 08306 doi 10 1093 mnras staa196 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 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 a b Yan Zhen Pan Zhi Chen Ransom Scott M Lorimer Duncan R Qian Lei Wang Pei Shen Zhi Qiang Li Di Jiang Peng Luo Jin Tao Liu Jie Huang Zhi Peng 2021 An Eclipsing Black Widow Pulsar in NGC 6712 The Astrophysical Journal 921 2 120 arXiv 2109 06754 Bibcode 2021ApJ 921 120Y doi 10 3847 1538 4357 ac25eb S2CID 237502882 External links Edit Media related to NGC 6712 at Wikimedia Commons NGC 6712 on WikiSky DSS2 SDSS GALEX IRAS Hydrogen a X Ray Astrophoto Sky Map Articles and images Simbad Webda NGC 6712 Retrieved from https en wikipedia org w index php title NGC 6712 amp oldid 1141432467, wikipedia, wiki, book, books, library,

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