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- 47_Tucanae abstract "47 Tucanae (NGC 104) or just 47 Tuc is a globular cluster located in the constellation Tucana. It is about 16,700 light years away from Earth, and 120 light years across. It can be seen with the naked eye, with a visual apparent magnitude of 4.9. Its number comes not from the Flamsteed catalogue, but the more obscure 1801 "Allgemeine Beschreibung und Nachweisung der Gestirne nebst Verzeichniss" compiled by Johann Elert Bode.47 Tucanae was discovered by Nicolas Louis de Lacaille in 1751, who thought it was the nucleus of a bright comet. Its southern location had hidden it from European observers until then. The cluster appears roughly the size of the full moon in the sky under ideal conditions.It is the second brightest globular cluster in the sky (after Omega Centauri), and is noted for having a very bright and dense core. It is also one of the most massive globular clusters in the Galaxy, containing millions of stars.The core of 47 Tuc was the subject of a major survey for planets, using the Hubble Space Telescope to look for partial eclipses of stars by their planets. No planets were found, though 10-15 were expected based on the rate of planet discoveries around stars near the Sun. This indicates that planets are relatively rare in globular clusters. A later ground-based survey in the uncrowded outer regions of the cluster also failed to detect planets when several were expected. This strongly indicates that the low metallicity of the environment, rather than the crowding, is responsible.47 Tuc's dense core contains a number of exotic stars of scientific interest. Globular clusters efficiently sort stars by mass, with the most massive stars falling to the center.47 Tuc contains at least 21 blue stragglers near its core.It also contains hundreds of X-ray sources, including stars with enhanced chromospheric activity due to their presence in binary star systems, cataclysmic variable stars containing white dwarfs accreting from companion stars, and low-mass X-ray binaries containing neutron stars that are not currently accreting, but can be observed by the X-rays emitted from the hot surface of the neutron star.47 Tuc has 23 known millisecond pulsars, the second largest population of pulsars in any globular cluster. These pulsars are thought to be spun up by the accretion of material from binary companion stars, in a previous X-ray binary phase. The companion of one pulsar in 47 Tucanae, 47 Tuc W, seems to still be transferring mass towards the neutron star, indicating that this system is completing a transition from being an accreting low-mass X-ray binary to a millisecond pulsar.X-ray emission has been individually detected from most millisecond pulsars in 47 Tuc with the Chandra X-ray Observatory, likely emission from the neutron star surface, and gamma-ray emission has been detected with the Fermi Gamma-ray Space Telescope from its millisecond pulsar population (making 47 Tuc the first globular cluster to be detected in gamma-rays).There is no evidence yet for the existence of any black holes in 47 Tuc; Hubble Space Telescope data provides the strongest constraint on the mass of any possible black hole at its center, < 1500 times the mass of our Sun.In December 2008, Ragbir Bhathal of the University of Western Sydney claimed the detection of a strong laser-like signal from the direction of 47 Tucanae.".
- 47_Tucanae thumbnail 47tuc_salt.jpg?width=300.
- 47_Tucanae wikiPageExternalLink 47tuc.
- 47_Tucanae wikiPageExternalLink cluster_4.php?ggc=47+Tuc.
- 47_Tucanae wikiPageExternalLink heic0616.
- 47_Tucanae wikiPageID "983423".
- 47_Tucanae wikiPageRevisionID "606508124".
- 47_Tucanae age "13.06".
- 47_Tucanae appmagV "+4.91".
- 47_Tucanae c "106".
- 47_Tucanae caption "47".
- 47_Tucanae class "III".
- 47_Tucanae constellation Tucana.
- 47_Tucanae epoch Epoch_(astronomy).
- 47_Tucanae hasPhotoCollection 47_Tucanae.
- 47_Tucanae metalFe "–0.78".
- 47_Tucanae name "47".
- 47_Tucanae names "ξ Tuc, NGC 104, GCl 1 1RXS J002404.6-720456".
- 47_Tucanae ngc "104".
- 47_Tucanae notes "2".
- 47_Tucanae radiusLy "60.0".
- 47_Tucanae sizeV "30".
- 47_Tucanae vHb "14.2".
- 47_Tucanae subject Category:Bayer_objects.
- 47_Tucanae subject Category:Caldwell_objects.
- 47_Tucanae subject Category:Flamsteed_objects.
- 47_Tucanae subject Category:Globular_clusters.
- 47_Tucanae subject Category:NGC_objects.
- 47_Tucanae subject Category:Tucana_(constellation).
- 47_Tucanae comment "47 Tucanae (NGC 104) or just 47 Tuc is a globular cluster located in the constellation Tucana. It is about 16,700 light years away from Earth, and 120 light years across. It can be seen with the naked eye, with a visual apparent magnitude of 4.9.".
- 47_Tucanae label "47 Tucanae".
- 47_Tucanae label "47 Tucanae".
- 47_Tucanae label "47 Tucanae".
- 47_Tucanae label "47 Tucanae".
- 47_Tucanae label "47 Tucanae".
- 47_Tucanae label "47 Tucanae".
- 47_Tucanae label "47 Tucanae".
- 47_Tucanae label "47 Тукана".
- 47_Tucanae label "NGC 104".
- 47_Tucanae label "きょしちょう座47".
- 47_Tucanae label "杜鵑座47".
- 47_Tucanae sameAs 47_Tucanae.
- 47_Tucanae sameAs 47_Tucanae.
- 47_Tucanae sameAs 47_Tucanae.
- 47_Tucanae sameAs 47_Tucanae.
- 47_Tucanae sameAs 47_Tucanae.
- 47_Tucanae sameAs きょしちょう座47.
- 47_Tucanae sameAs 큰부리새자리_47.
- 47_Tucanae sameAs 47_Tucanae.
- 47_Tucanae sameAs NGC_104.
- 47_Tucanae sameAs 47_Tucanae.
- 47_Tucanae sameAs m.03wl3h.
- 47_Tucanae sameAs Q14276.
- 47_Tucanae sameAs Q14276.
- 47_Tucanae wasDerivedFrom 47_Tucanae?oldid=606508124.
- 47_Tucanae depiction 47tuc_salt.jpg.
- 47_Tucanae isPrimaryTopicOf 47_Tucanae.