Delta Delphini

**Delta Delphini A/B**

Constelación	Delphinus
Ascensión recta α	20h 43min 27,55s
Declinación δ	+15º 04’ 28,9’’
Distancia	203 años luz
Magnitud visual	+4,43 (conjunta)
Magnitud absoluta	+0,45 (conjunta)
Luminosidad	25,5 / 25,5 soles
Temperatura	7000 / 7000 K
Masa	2 / 2 soles (aprox)
Radio	3,4 / 3,4 soles (aprox)
Tipo espectral	F0IV / F0IV
Velocidad radial	+9,3 km/s

Delta Delphini (δ Del / 11 Delphini / HD 197461)^[1] es una estrella en la constelación de Delphinus, la quinta más brillante de la misma con magnitud aparente +4,43. Se encuentra a 203 años luz de distancia del sistema solar.

Delta Delphini es una estrella binaria cercana cuya duplicidad sólo ha sido conocida por espectroscopia. Ambas estrellas parecen ser idénticas y completan una órbita cada 40,58 días, lo que corresponde a una separación real entre ellas de 0,37 UA. Clasificada oficialmente como gigante de tipo espectral A7III, su temperatura excepcionalmente baja de 7000 K se ajusta más a una estrella subgigante de tipo F0. La diferencia puede deberse a su bajo contenido en metales.^[2]

La luminosidad de cada una de las estrellas —que puede ser muy parecida— es del orden de 25,5 soles, lo que conlleva un radio de 3,4 radios solares y una masa de 2 masas solares para cada una.^[2]

Ambas estrellas parecen ser estrellas variables. Una de ellas es una variable Delta Scuti con variaciones de 0,1 magnitudes en múltiples períodos de 0,156, 0,136 y 0,153 días. La otra parece tener un único período de variación.^[2]

Referencias

↑ Delta Delphini (SIMBAD)
↑ ^a ^b ^c Delta Delphini (Stars, Jim Kaler) (enlace roto disponible en Internet Archive; véase el historial, la primera versión y la última).

Datos: Q3236063

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