46 Capricorni

46 Capricorni
Constelación Capricornus
Ascensión recta α 21h 45min 00,25s
Declinación δ -09º 04’ 56,7’’
Distancia 783 años luz
Magnitud visual +5,09
Magnitud absoluta -1,85
Luminosidad 627 soles
Temperatura 4600 - 4815 K
Masa 4,6 soles (aprox)
Radio 25 soles
Tipo espectral G8Iab
Velocidad radial -4,9 km/s

46 Capricorni (46 Cap / c Capricorni / HD 206834)[1]​ es una estrella de magnitud aparente +5,09 situada en la constelación de Capricornio. Aunque no tiene nombre propio habitual, formaba —junto a ξ Aquarii y Sadalsuud (β Aquarii)— la vigesimosegunda mansión lunar árabe, también llamada Sadalsuud.[2]​

46 Capricorni es una supergigante amarilla de tipo espectral G8Iab —anteriormente catalogada como gigante G8II-III—[3]​ con una temperatura efectiva entre 4600 K[4]​ y 4815 K.[5]​ Su luminosidad es 627 veces superior a la del Sol y posee un diámetro 25 veces más grande que el diámetro solar.[6]​ Gira sobre sí misma con una velocidad de rotación proyectada de 3,75 km/s.[5]​

46 Capricorni tiene una masa aproximada entre 4 y 5 masas solares. Su metalicidad —abundancia relativa de elementos más pesados que el helio en una estrella— es menor que la solar en un 35% ([Fe/H] = -0,19).[7]​ Un estudio comparativo entre más de 600 gigantes luminosas refleja que su contenido de litio es elevado para una estrella de sus características (logє[Li] = 0,80).[8]​ Se encuentra aproximadamente a 783 años luz del sistema solar.[4]​

Referencias

  1. ↑ c Cap -- Star (SIMBAD)
  2. ↑ Allen, Richard Hinckley (1889). «Aquarius». En Courier Dover Publications, ed. Star Names — Their Lore and Meaning (en inglés). pp. 563. ISBN 0-486-21079-0. Consultado el septiembre de 2011. 
  3. ↑ 46 Capricorni Archivado el 16 de noviembre de 2011 en Wayback Machine. (The Bright Star Catalogue)
  4. ↑ a b Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (2010). «Masses and luminosities of O- and B-type stars and red supergiants». Astronomische Nachrichten 331 (4). p. 349. 
  5. ↑ a b Hekker, S.; Meléndez, J. (2007). «Precise radial velocities of giant stars. III. Spectroscopic stellar parameters». Astronomy and Astrophysics 475 (3). pp. 1003-1009. 
  6. ↑ 46 Capricorni (CADARS)
  7. ↑ Cayrel de Strobel, G.; Soubiran, C.; Ralite, N. (2001). «Catalogue of (Fe/H) determinations for FGK stars: 2001 edition». Astronomy and Astrophysics 373. pp. 159-163. 
  8. ↑ Brown, Jeffery A.; Sneden, Christopher; Lambert, David L.; Dutchover, Edward, Jr. (1989). «A search for lithium-rich giant stars». The Astrophysical Journal Supplement Series 71. pp. 293-322. 

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