KX Velorum

KX Velorum
Datos de observación
(Época J2000.0)
Constelación Vela
Ascensión recta (α) 08h 50min 33,46s
Declinación (δ) -46º 31’ 45,1’’
Mag. aparente (V) +5,09
Características físicas
Clasificación estelar B0III
Masa solar 13,8 - 19,2 M
Magnitud absoluta -4,50
Luminosidad 120.000 L
Temperatura superficial 29.000 K
Variabilidad Binaria eclipsante
Edad 6,1 ± 2,0 × 106 años
Astrometría
Velocidad radial 7 km/s
Distancia 3205 años luz (983 pc)
Paralaje 1,017 ± 0,276 mas
Sistema
N.º de componentes 3
Referencias
SIMBAD enlace
Otras designaciones
f Velorum / HD 75821 / HR 3527 / HIP 43413 / SAO 220561 / BD-46 4661

KX Velorum (KX Vel / f Velorum)[1][2]​ es un sistema estelar situado en la constelación de Vela. Tiene magnitud aparente +5,09 y se encuentra, de acuerdo a la nueva reducción de los datos de paralaje de Hipparcos, a una distancia aproximada de 983 pársecs (3205 años luz) del sistema solar; no obstante, debido al error en la medida del paralaje, su distancia podría ser de hasta 4400 años luz.[3]

La componente principal de KX Velorum es una gigante blanco-azulada de tipo espectral B0III.[1]​ Tiene una elevada temperatura efectiva de 29.000 K y una luminosidad 120.000 veces superior a la del Sol.[3]​ Distintas fuentes estiman su masa entre 13,8 y 19,2 masas solares,[4][3]​ en cualquier caso por encima del límite a partir del cual las estrellas finalizan su vida explosionando como supernovas. Es una binaria espectroscópica —su naturaleza binaria es conocida por el desplazamiento Doppler de sus líneas espectrales— con un período orbital de 26,31 días.[5]​ La acompañante eclipsa la estrella principal produciendo una disminución de brillo de 0,08 magnitudes.[6]

Una tercera componente completa el sistema KX Velorum. Visualmente a 3,2 segundos de arco de la binaria espectroscópica se puede observar una estrella de décima magnitud que se piensa que también forma parte del sistema.[5]​ El conjunto tiene una edad aproximada de 6,1 ± 2,0 millones de años.[4]

Referencias

  1. a b V* KX Vel -- Spectroscopic binary (SIMBAD)
  2. f Velorum Archivado el 4 de marzo de 2016 en Wayback Machine. (Alcyone)
  3. a b c 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. 
  4. a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). «A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun». Monthly Notices of the Royal Astronomical Society 410 (1). pp. 190-200. 
  5. a b Eggleton, P. P.; Tokovinin, A. A. (2008). «A catalogue of multiplicity among bright stellar systems». Monthly Notices of the Royal Astronomical Society 389 (2). pp. 869-879. 
  6. Malkov, O. Yu.; Oblak, E.; Snegireva, E. A.; Torra, J. (2006). «A catalogue of eclipsing variables». Astronomy and Astrophysics 446 (2). pp. 785-789. 

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