GS 2000+25

GS 2000+25
Observation data Epoch J2000 Equinox J2000
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.
Constellation	Vulpecula
Right ascension	20^h 02^m 49.58^s^[2]
Declination	+25° 14′ 11.3″^[2]
Apparent magnitude (V)	18.2^[2]
Characteristics
Spectral type	Black hole + K3-6 V^[3]
Astrometry

Distance	8800 ± 2300 ly (2700 ± 700^[4] pc)

Orbit
Period (P)	8.26 hr^[2]
Details
Black hole
Mass	7.2–7.8^[3] `M`_☉

Other designations
Nova Vul 1988, INTREF 1007, QZ Vul^[5]
Database references
SIMBAD	data

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.

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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]

References

^ 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. Bibcode:1993A&A...269..301C. Retrieved 28 May 2022.
^ ^a ^b ^c ^d 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. arXiv:0707.0544. Bibcode:2007A&A...469..807L. doi:10.1051/0004-6361:20077303. S2CID 14673570.
^ ^a ^b Yungelson, L; Lasota, J.-P (2008). "Evolution of low-mass binaries with black-hole components". New Astronomy Reviews. 51 (10–12): 860–868. arXiv:0801.3433. Bibcode:2008NewAR..51..860Y. doi:10.1016/j.newar.2008.03.017. S2CID 11830754.
^ 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. arXiv:0804.0370. Bibcode:2008MNRAS.387..788R. doi:10.1111/j.1365-2966.2008.13272.x. S2CID 16918671.
^ "GS 2000+25". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 November 2017.
^ 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. Bibcode:1995ApJ...455L.139F. doi:10.1086/309831. S2CID 123161764.

Constellation of Vulpecula

Stars

Bayer	α (Anser)
Flamsteed	1 2 3 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 35 3 Cyg
Variable	R S T U V X Z RS SV VW WW AW BE BO BP BS BW DR ER LT LV MW NQ NR NS PS PU PW PX QQ QR QU QV QY V379 V387 V407 V452 V457 V458
HR	7207 7250 7263 7286 7364 7384 7391 7421 7452 7472 7490 7540 7556 7573 7601 7656 7716 7760 7811 7849 7862 7895 7903 8082 8158 8190 8194 8197 8198
HD	186943 187614 188015 189671 190066 190228 190322 201626
Other	BD+23 3912 G 185-32 GD 385 GS 2000+25 HIP 100963 PSR B1919+21 PSR B1930+22 PSR B1937+21 PSR B1953+29 PSR B2020+28 PSR J1946+2052 PSR J2007+2722 Wolf 1346 WR 125 XTE J1859+226 SGR 1935+2154

Exoplanets	HD 188015 b HD 189733 b

Star clusters	Brocchi's Cluster NGC 6885 NGC 6940

Nebulae	Dumbbell Nebula Hen 2-437 Sh2-88

Galaxies

NGC	7052 7080
Other	3C 433

Astronomical events	AT 2021lwx

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Properties

See also

References