Pi1 Orionis

Pi1 Orionis
Constelación Orión
Ascensión recta α 04h 54m 53,73s
Declinación δ +10º 09’ 03,0’’
Distancia 121 años luz
Magnitud visual +4,66
Magnitud absoluta +1,80
Luminosidad 26 soles
Temperatura 9000 K (aprox)
Masa 2,9 soles
Radio 2,7 soles
Tipo espectral A0V
Velocidad radial +13 km/s

Pi1 Orionis1 Ori / 7 Orionis / HD 31295)[1]​ es una estrella en la constelación de Orión. Comparte la denominación de Bayer Pi Orionis con otras cinco estrellas, siendo, con magnitud aparente +4,66, la menos brillante entre ellas. Se encuentra a 121 años luz de distancia del sistema solar.

Pi1 Orionis es una estrella blanca de la secuencia principal de tipo espectral A0V. Su temperatura superficial es de 8651 K[2]​ —aunque otros autores señalan una temperatura 850 K más alta—[3]​ y es 26 veces más luminosa que el Sol. Al igual que otras estrellas similares, Pi1 Orionis rota muy deprisa, siendo su velocidad de rotación igual o superior a 120 km/s,[4]​ 60 veces mayor que la del Sol. Su diámetro es 2,7 veces más grande que el de nuestra estrella.[5]

Con una masa de casi 3 masas solares, Pi1 Orionis parece ser una joven estrella de sólo 10 millones de años de edad.[3]​ Posee una metalicidad muy baja, suponiendo esta menos del 20% de la que tiene el Sol.[2]​ Exhibe un exceso en el infrarrojo a 20 y 70 μm, sugiriendo la presencia de un disco circunestelar de polvo a su alrededor;[6]Vega (α Lyrae), Fomalhaut (α Piscis Austrini) y Denébola (β Leonis) son estrellas análogas que también se hallan rodeadas por un disco de similares características.

Una estrella de magnitud +12,7, visualmente a 39 segundos de arco de Pi1 Orionis, puede estar físicamente relacionada con ella.

Referencias

  1. Pi1 Orionis (SIMBAD)
  2. a b Saffe, C.; Gómez, M.; Pintado, O.; González, E. (2008). «Spectroscopic metallicities of Vega-like stars». Astronomy and Astrophysics 490 (1). pp. 297-305. 
  3. a b Wyatt, M. C.; Smith, R.; Su, K. Y. L.; Rieke, G. H.; Greaves, J. S.; Beichman, C. A.; Bryden, G. (2007). «Steady State Evolution of Debris Disks around A Stars». The Astrophysical Journal 663 (1). pp. 365-382. 
  4. Royer, F.; Zorec, J.; Gómez, A. E. (2007). «Rotational velocities of A-type stars. III. Velocity distributions». Astronomy and Astrophysics 463 (2). pp. 671-682. 
  5. Pi1 Orionis Catalogue of Stellar Diameters (CADARS)
  6. Su, K. Y. L.; Rieke, G. H.; Stansberry, J. A.; Bryden, G.; Stapelfeldt, K. R.; Trilling, D. E.; Muzerolle, J.; Beichman, C. A.; Moro-Martin, A.; Hines, D. C.; Werner, M. W. (2006). «Debris Disk Evolution around A Stars». The Astrophysical Journal 653 (1). pp. 675-689. 

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