NT Vulpeculae

NT Vulpeculae
Constelación Vulpecula
Ascensión recta α 20h 01min 06,1s
Declinación δ +27º 45’ 13’’
Distancia 223 años luz
Magnitud visual +4,65
Magnitud absoluta +0,48
Luminosidad 58 soles
Temperatura ~ 7820 K
Radio 1,8 soles
Tipo espectral A4III
Velocidad radial -20,9 km/s

NT Vulpeculae (15 Vulpeculae / HD 189849 / HR 7653)[1]​ es una estrella variable en la constelación de Vulpecula —la zorra— de magnitud aparente +4,65. Se encuentra a 223 años luz de distancia del sistema solar.

NT Vulpeculae está catalogada como una estrella gigante de color blanco y tipo espectral A4III,[2]​[1]​ con una temperatura superficial de ~ 7820 K.[3]​ Con un radio un 80 % más grande que el radio solar,[4]​ su tamaño no es comparable al de las gigantes rojas —considerablemente más grandes—, siendo la luminosidad de NT Vulpeculae 58 veces superior a la luminosidad solar. Tiene una metalicidad un 20 % más alta que la del Sol[5]​ y su velocidad de rotación es igual o superior a 16 km/s.[6]​ Es además una binaria espectroscópica, con un período orbital de 3195 días.[2]​

NT Vulpeculae es una estrella con líneas metálicas (estrella Am)[3]​ y una variable Alfa2 Canum Venaticorum. Este tipo de estrellas tienen intensos campos magnéticos y presentan líneas espectrales fuertes de algunos elementos químicos que varían con la rotación de la estrella. El brillo de NT Vulpeculae varía 0,05 magnitudes en un ciclo de 14,0 días.[7]​

Referencias

  1. ↑ a b NT Vulpeculae (SIMBAD)
  2. ↑ a b NT Vulpeculae Archivado el 4 de marzo de 2016 en Wayback Machine. (The Bright Star Catalogue)
  3. ↑ a b Netopil, M.; Paunzen, E.; Maitzen, H. M.; North, P.; Hubrig, S. (2008). «Chemically peculiar stars and their temperature calibration». Astronomy and Astrophysics 491 (2). pp. 545-554. 
  4. ↑ 15 Vulpeculae Catalogue of Stellar Diameters (CADARS)
  5. ↑ Cenarro, A. J.; Peletier, R. F.; Sánchez-Blázquez, P.; Selam, S. O.; Toloba, E.; Cardiel, N.; Falcón-Barroso, J.; Gorgas, J.; Jiménez-Vicente, J.; Vazdekis, A. (2007). «Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters». Monthly Notices of the Royal Astronomical Society 374 (2). pp. 664-690. 
  6. ↑ 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. 
  7. ↑ NT Vulpeculae (General Catalogue of Variable Stars)

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