GS 2000+25

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.^[1]

References

↑ Filippenko, Alexei V.; Matheson, Thomas; Barth, Aaron J. (1995). "A Black Hole in the X-Ray Nova GS 2000+25". Astrophysical Journal Letters v.455. 455 (2): L139. Bibcode:1995ApJ...455L.139F. doi:10.1086/309831.

Stars of Vulpecula
Bayer	α (Anser)
Flamsteed	1 2 3 4 5 7 8 9 10 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 CK 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 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 J2007+2722 Wolf 1346 WR 125 XTE J1859+226
List

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