Astronomy:GS 2000+25

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Short description: Star in the constellation Vulpecula
GS 2000+25
QZVulLightCurve.png
Near-infrared (I band) light curves for QZ Vulpeculae, adapted from Chevalier and Ilovaisky (1993).[1] The data were collected over a 10 night period in July 1991. Data collected on different nights are plotted with different colors. The shape of the light curve changed over a period of approximately two days, leading to different shapes on even or odd numbered days.
Observation data
Equinox J2000.0]] (ICRS)
Constellation Vulpecula
Right ascension  20h 02m 49.58s[2]
Declination +25° 14′ 11.3″[2]
Apparent magnitude (V) 18.2[2]
Characteristics
Spectral type Black hole + K3-6 V[3]
Astrometry
Distance8800 ± 2300 ly
(2700 ± 700[4] pc)
Orbit
Period (P)8.26 hr[2]
Details
Black hole
Mass7.2–7.8[3] M
Other designations
Nova Vul 1988, INTREF 1007, QZ Vul[5]
Database references
SIMBADdata

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.

Properties

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.[6]

See also

References

  1. Chevalier, C.; Ilovaisky, S. A. (March 1993). "Optical studies of transient low-mass X-ray binaries. IV. A 10-hour distorsion wave in the quiescent light curve of GS 2000+25". Astronomy and Astrophysics 269: 301–309. Bibcode1993A&A...269..301C. https://ui.adsabs.harvard.edu/abs/1993A&A...269..301C. Retrieved 28 May 2022. 
  2. 2.0 2.1 2.2 2.3 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. 
  3. 3.0 3.1 Yungelson, L; Lasota, J.-P (2008). "Evolution of low-mass binaries with black-hole components". New Astronomy Reviews 51 (10–12): 860–868. doi:10.1016/j.newar.2008.03.017. Bibcode2008NewAR..51..860Y. 
  4. 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. 
  5. "GS 2000+25". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GS+2000%2B25. 
  6. 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.