RT Capricorni

RT Capricorni
Constelación Capricornio
Ascensión recta α 20h 17min 06,53s
Declinación δ -21º 19’ 04,5’’
Distancia 1825 años-luz (aprox)
Magnitud visual +7,18 (media)
Magnitud absoluta -4,95 (bolométrica)
Luminosidad 7450 soles
Temperatura 2480 K
Radio 500 soles (aprox)
Tipo espectral CV6
Velocidad radial -30 km/s

RT Capricorni (RT Cap / HD 192737 / HIP 99990)[1]​ es una estrella variable en la constelación de Capricornio. Se encuentra a una distancia aproximada de 1825 años luz del sistema solar.[2]​

RT Capricorni es una estrella de carbono de tipo espectral CV6 con una temperatura superficial de sólo 2480 K. En las estrellas de carbono, al contrario que en la mayor parte de las estrellas, el contenido de carbono es mayor que el de oxígeno; la relación carbono-oxígeno en RT Capricorni es de 1,10. Además, estas estrellas experimentan una pérdida de masa estelar significativa; RT Capricorni lo hace a razón de 2,3 × 10-7 masas solares por año.[2]​ Su luminosidad bolométrica —considerando todas las longitudes de onda— es ~ 7450 veces superior a la luminosidad solar.[2]​ Mediante interferometría se ha medido su diámetro angular en banda K, el cual es de 8,18 ± 0,21 milisegundos de arco.[3]​ Ello permite evaluar su diámetro real, siendo éste 500 veces más grande que el diámetro solar; dicha cifra, al depender de la distancia y dada la incertidumbre en la misma, es sólo aproximada.

Catalogada como variable semirregular SRB, el brillo de RT Capricorni varía entre magnitud aparente +6,8 y +8,0 en un período de 423 días.[4]​

Véase también

Referencias

  1. ↑ RT Cap - Semi-regular pulsating Star (SIMBAD)
  2. ↑ a b c Bergeat, J.; Chevallier, L. (2005). «The mass loss of C-rich giants». Astronomy and Astrophysics 429. pp. 235-246. 
  3. ↑ 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). 
  4. ↑ RT Capricorni (General Catalogue of Variable Stars)

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