Astronomy:GS 2000+25

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GS 2000+25
Observation data
Equinox J2000.0]] (ICRS)
Constellation Vulpecula
Right ascension  20h 02m 49.58s[1]
Declination +25° 14′ 11.3″[1]
Apparent magnitude (V) 18.2[1]
Spectral type Black hole + K3-6 V[2]
Distance8800 ± 2300 ly
(2700 ± 700[3] pc)
Period (P)8.26 hr[1]
Black hole
Mass7.2–7.8[2] M
Other designations
Nova Vul 1988, INTREF 1007, QZ Vul[4]
Database references

GS 2000+25 is an X-ray binary system in the constellation Vulpecula, consisting of a late K-type star and a black hole. It is also an X-ray nova.


Because the black hole is more massive than the companion star, it is the primary of the system. The black hole has a mass of about 5 solar masses while the companion has a mass of about 0.5 solar masses. Because the companion star has a low mass, the system is a low-mass X-ray binary.[5][failed verification]

See also


  1. 1.0 1.1 1.2 1.3 Liu, Q. Z; Van Paradijs, J; Van Den Heuvel, E. P. J (2007). "A catalogue of low-mass X-ray binaries in the Galaxy, LMC, and SMC (Fourth edition)". Astronomy & Astrophysics 469 (2): 807. doi:10.1051/0004-6361:20077303. Bibcode2007A&A...469..807L. 
  2. 2.0 2.1 Yungelson, L; Lasota, J.-P (2008). "Evolution of low-mass binaries with black-hole components". New Astronomy Reviews 51 (10–12): 860. doi:10.1016/j.newar.2008.03.017. Bibcode2008NewAR..51..860Y. 
  3. Reynolds, Mark T; Callanan, Paul J; Robinson, Edward L; Froning, Cynthia S (2008). "Infrared contamination in Galactic X-ray novae". Monthly Notices of the Royal Astronomical Society 387 (2): 788. doi:10.1111/j.1365-2966.2008.13272.x. Bibcode2008MNRAS.387..788R. 
  4. "GS 2000+25". SIMBAD. Centre de données astronomiques de Strasbourg. 
  5. Filippenko, Alexei V.; Matheson, Thomas; Barth, Aaron J. (1995). "A Black Hole in the X-Ray Nova GS 2000+25". Astrophysical Journal Letters 455 (2): L139. doi:10.1086/309831. Bibcode1995ApJ...455L.139F.