X Persei

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X Persei A
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 03h55m23.08s
Declination +31°02′45.1″
Apparent magnitude (V) 6.79
Spectral type O9.5IIIe-B0Ve
Distance 2694 ly
Absolute magnitude (MV) −2.80
Companion X Persei B
Period (P) 0.685 yr
Semi-major axis (a) 2 AU"
Mass 15 M
Radius R
Luminosity 24,000 L
Temperature 29,500 K
Age <10,000,000 years

X Persei is a binary star system located in the constellation Perseus. X Persei A is either an O-type giant or a B-type main sequence star, which is orbited by a neutron star (X Persei B).[1][2] With an apparent magnitude of 6.72, it is too dim to be seen even on the best nights.[2] The system is an X-ray source and the primary star appears to be suffering from substantial mass loss.[3]


  1. ^ Delgado‐Marti, H.; Levine, A. M.; Pfahl, E.; Rappaport, S. A. (2001). "The Orbit of X Persei and Its Neutron Star Companion". The Astrophysical Journal 546: 455. arXiv:astro-ph/0004258. Bibcode:2001ApJ...546..455D. doi:10.1086/318236.  edit
  2. ^ a b "V* X Per – High Mass X-ray Binary". SIMBAD. Retrieved 8 February 2013. 
  3. ^ White, N. E.; Swank, J. H.; Holt, S. S.; Parmar, A. N. (1 December 1982). "A comparaison of the X-ray properties of X Persei and Gamma Cassiopeiae" 263. Astrophysical Journal. pp. 277–288. Bibcode:1982ApJ...263..277W. doi:10.1086/160502.