BlackCAT A Catalog of Stellar-Mass Black Holes in X-ray Binaries

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ID# 13

GS 2000+251

QZ Vul

(Okamura1988Hjellming1988)

RA     (ICRS)     DEC [hh:mm:ss.ss]          [dd:mm:ss.ss] 20:02:49.48  +25:14:11.36

ℓ                      b [deg]                            [deg] 063.3663891  -02.99847575

Year of discovery: 1988  
(Makino1988)

# of outbursts after discovery:

Basic data

Distance [kpc]	2.7±0.7	Jonker2004
Distance to the plane (z) [kpc]	-0.14±0.04	Jonker2004
Orbital period (Porb) [h]	8.258095±0.000005	Charles1991Casares1995aIoannou2004
Peak X-ray flux [erg s-1 cm-2] [keV]	3.46E-07 [2-10]	Tsunemi1989
Outburst magnitude (AB)	V=16.4	Wagner1988Charles1988
Quiescent magnitude (AB)	R=21.3±0.2	Callanan1991Beekman1996
E(B-V) [mag]	1.1 – 1.7	Charles1991Casares1995a

Dynamically confirmed BH

NOTES

Dynamical parameters

Orbital period [h]	8.258095±0.000005	Charles1991Casares1995aIoannou2004
Star's spectral type	K3 – 7V	Casares1995aHarlaftis1996
Star's radial velocity amplitude (K2) [km/s]	520±5	Casares1995aHarlaftis1996
Mass function 'f(M1)' [M☉]	5±0.1	Casares1995aHarlaftis1996
BH mass (M1) [M☉]	5.5 – 8.8	Ioannou2004
Mass ratio (q=M2/M1)	0.04±0.01	Harlaftis1996
Inclination angle (i) [deg]	54 – 60	Ioannou2004
Rot. broadening (v sini) [km/s]	86±8	Casares1995aHarlaftis1996

Optical/NIR magnitudes

Mag. Outburst (AB) Wagner1988Charles1988
	V=16.4
Mag. Quiescent (AB) Callanan1991Beekman1996
			R=21.3±0.2
	I=20.2±0.2
J=19.0±0.2	H=18.37±0.03	Ks=18.9±0.2

Aladin finding chart

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Default image: DSS2 Red

GS 2000+251 in Simbad

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Pan-STARRS1 finding chart

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Finding charts

Orientation: North up, East left. Object marked
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Finding chart reference: Callanan1991

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