49 Cancri

49 Cancri
Datos de observación
(Época J2000.0)
Constelación Cáncer
Ascensión recta (α) 08h 44min 45,04s
Declinación (δ) +10º 04’ 54,0’’
Mag. aparente (V) +5,63
Características físicas
Clasificación estelar A1p
Masa solar 2,92 ± 0,12 M☉
Radio (2,2 R☉)
Magnitud absoluta +0,15
Luminosidad 110 L☉
Temperatura superficial 10.790 K
Variabilidad Alfa2 Canum Venaticorum
Edad 263 x 106 años
Astrometría
Velocidad radial +24,4 km/s
Distancia 421 años luz (129 pc)
Paralaje 7,71 ± 0,34 mas
Referencias
SIMBAD enlace
Otras designaciones
b Cancri / BI Cancri / HD 74521 / HR 3465 / HIP 42917 / SAO 98089
[editar datos en Wikidata]

49 Cancri (49 Cnc / b Cancri)[1]​[2]​ es una estrella de magnitud aparente +5,63 situada en la constelación de Cáncer. Se encuentra a 421 años luz de distancia del sistema solar.

49 Cancri es una estrella de tipo espectral A1p[1]​ con una temperatura efectiva de 10.790 K. Tiene una luminosidad 110 veces superior a la luminosidad solar y una masa 2,92 veces mayor que la del Sol.[3]​ Gira sobre sí misma con una velocidad de rotación proyectada de 18 km/s.[4]​ Su edad se estima en 263 millones de años, que corresponde a unas 2/3 partes de su vida como estrella de la secuencia principal.[3]​

49 Cancri es una estrella químicamente peculiar —concretamente una estrella Ap con líneas de absorción fuertes de europio y cromo—,[2]​ semejante a α Circini o Alioth (ε Ursae Majoris). Es una estrella magnética cuyo campo magnético efectivo <Be> es de 709 G.[5]​ Su brillo es variable, observándose una variación de 0,13 magnitudes en un período de 4,2359 días. Clasificada como variable Alfa2 Canum Venaticorum, en cuanto a variable recibe el nombre de BI Cancri.[6]​

Referencias

  1. ↑ a b V* BI Cnc -- Variable Star of alpha2 CVn type (SIMBAD)
  2. ↑ a b BI Cnc Archivado el 4 de marzo de 2016 en Wayback Machine. (The Bright Star Catalogue)
  3. ↑ a b Kochukhov, O.; Bagnulo, S. (2006). «Evolutionary state of magnetic chemically peculiar stars». Astronomy and Astrophysics 450 (2). pp. 763-775. 
  4. ↑ Royer, F.; Grenier, S.; Baylac, M.-O.; Gómez, A. E.; Zorec, J. (2002). «Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i». Astronomy and Astrophysics 393. pp. 897-911. 
  5. ↑ Glagolevskij, Yu. V. (2007). «Magnetic-field dependence of chemical anomalies in CP stars». Astrophysical Bulletin 62 (3). pp. 244-256. 
  6. ↑ BI Cnc (General Catalogue of Variable Stars)

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