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Al Minliar al Shuja

Al Minliar al Shuja
Constelación Hidra
Ascensión recta α 08h 38min 45,44s
Declinación δ +03º 20’ 29,2’’
Distancia 353 años luz
Magnitud visual +4,44
Magnitud absoluta -0,72
Luminosidad 166 soles
Temperatura 4489 K
Radio 34 soles
Tipo espectral K1III
Velocidad radial +27,28 km/s

Al Minliar al Shuja (σ Hydrae / σ Hya / 5 Hydrae)[1]​[2]​ es una estrella en la constelación de Hidra de magnitud aparente +4,44. Su nombre, en árabe «la nariz de la hidra», indica su posición en la cabeza de la hidra; Minchir y Minchar, nombres también utilizados para designar a esta estrella, provienen de la misma raíz árabe. Se encuentra a 353 años luz del sistema solar.

Al Minliar al Shuja es una gigante naranja de tipo espectral K1III[1]​ con una temperatura efectiva de ~ 4489 K.[3]​ Tiene un diámetro 34 veces más grande que el del Sol, cifra calculada a partir de la medida directa de su diámetro angular considerando el oscurecimiento de limbo —2,25 milisegundos de arco—.[4]​ Su luminosidad es unas 166 veces mayor que la luminosidad solar.

Al Minliar al Shuja posee una metalicidad mayor que la del Sol, con una abundancia relativa de hierro entre un 30 y un 40% superior a la solar.[3]​[5]​ En relación con este último elemento, las abundancias de sodio y silicio son mayores que en el Sol, mientras que para el calcio se observa una tendencia inversa.[5]​ Gira sobre sí misma con una velocidad de rotación proyectada de 2,95 km/s.[6]​

Referencias

  1. ↑ a b Sigma Hydrae - Star (SIMBAD)
  2. ↑ Al Minliar al Shuja Archivado el 4 de marzo de 2016 en Wayback Machine. (The Bright Star Catalogue)
  3. ↑ a b Cenarro, A. J.; Peletier, R. F.; Sánchez-Blázquez, P.; Selam, S. O.; Toloba, E.; Cardiel, N.; Falcón-Barroso, J.; Gorgas, J.; Jiménez-Vicente, J.; Vazdekis, A. (2007). «Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters». Monthly Notices of the Royal Astronomical Society 374 (2). pp. 664-690. 
  4. ↑ Richichi, A.; Percheron, I.; Khristoforova, M. (2005). «CHARM2: An updated Catalog of High Angular Resolution Measurements». Astronomy and Astrophysics 431 (4). pp. 773-777 (Tabla consultada en CDS). 
  5. ↑ a b Fulbright, Jon. P.; McWilliam, Andrew; Rich, R. Michael (2007). «Abundances of Baade's Window Giants from Keck HIRES Spectra. II. The Alpha and Light Odd Elements». The Astrophysical Journal 661 (2). pp. 1152-1179. 
  6. ↑ Hekker, S.; Meléndez, J. (2007). «Precise radial velocities of giant stars. III. Spectroscopic stellar parameters». Astronomy and Astrophysics 475 (3). pp. 1003-1009. 

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