CL Draconis

CL Draconis
Constelación Draco
Ascensión recta α 15h 57min 47,44s
Declinación δ +54º 44’ 59,1’’
Distancia 110 años luz
Magnitud visual +4,97
Magnitud absoluta +2,31
Luminosidad 11 soles
Temperatura 7235 K
Radio ?
Tipo espectral F0IV
Velocidad radial –11 km/s

CL Draconis (CL Dra / HD 143466 / HR 5960)[1]​ es una estrella variable de magnitud aparente +4,97. Está situada en la constelación de Draco cerca del límite con Bootes. Estuvo encuadrada en Quadrans Muralis, constelación hoy desaparecida que representaba un cuadrante, siendo la estrella más brillante de la misma. Se encuentra a 110 años luz de distancia del sistema solar.

CL Draconis es una subgigante blanca de tipo espectral F0IV.[1]​ De parecidas características a las de Wasat (δ Geminorum) o μ Ceti, tiene una temperatura efectiva de aproximadamente 7235 K,[2]​ brillando con una luminosidad 11 veces mayor que la luminosidad solar. Su contenido metálico —entendiendo por metales aquellos elementos más pesados que el helio— es comparable al del Sol, excepto para titanio, cromo y bario, más abundantes que en nuestra estrella.[3]​ Gira sobre sí misma a gran velocidad —igual o superior a 141 km/s—, correspondiendo un período de rotación máximo de 18,48 horas.[2]​

CL Draconis es una variable Delta Scuti, siendo debidos los cambios de luminosidad a pulsaciones radiales y no-radiales de su superficie. Como es característico de estas variables, la fluctuación de brillo de CL Draconis es pequeña, de solo 0,02 magnitudes.[4]​ Existen dos períodos conocidos de 1,629 y 1,183 horas.[3]​ Su variabilidad fue descubierta por M. Breger en 1969.[5]​

Referencias

  1. ↑ a b CL Draconis - Variable Star of delta Sct type (SIMBAD)
  2. ↑ a b Reiners, A. (2006). «Rotation- and temperature-dependence of stellar latitudinal differential rotation». Astronomy and Astrophysics 446 (1). pp. 267-277. 
  3. ↑ a b Fossati, L.; Kolenberg, K.; Reegen, P.; Weiss, W. (2009). «Abundance analysis of seven δ Scuti stars». Astronomy and Astrophysics 485 (1). pp. 257-265. 
  4. ↑ CL Draconis (General Catalogue of Variable Stars)
  5. ↑ Breger, M. (1969). «Short-period variability of B, A, and F stars. II. Photometry of new Delta Scuti stars». The Astronomical Journal 74 (Contrib. Kitt Peak National Obs., No. 414). pp. 166 - 176. 

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