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

ID# 13

GS 2000+251

QZ Vul

RA (h:m:s)  DEC (º:':")  J2000:
20:02:49.48 +25:14:11.36
( Okamura1988 Hjellming1988 )

Galactic l (º)  b (º)  J2000:
063.3663891  -02.9984758

Year of discovery: 1988  
( Makino1988 )

# of outbursts after discovery:

Dynamically confirmed BH

Basic data

Distance (d) 2.7±0.7 (kpc) Jonker2004
d above plane (z) -0.14±0.04 (kpc) Jonker2004
Orbital period 8.258095±5E-06 (h) Charles1991 Casares1995a Ioannou2004
Peak X-ray flux 3.46E-07
(erg/s/cm2) [keV] Tsunemi1989
Outburst magnitude (AB) V=16.4 (mag) Wagner1988 Charles1988
Quiescent magnitude (AB) R=21.3±0.2 (mag) Callanan1991 Beekman1996
E(B-V) 1.1 – 1.7 (mag) Charles1991 Casares1995a

Dynamical parameters

Orbital period 8.258095±5E-06 (h) Charles1991 Casares1995a Ioannou2004
Star's spectral type K3 – 7V Casares1995a Harlaftis1996
Star's radial velocity amplitude (K2) 520±5 (km/s) Casares1995a Harlaftis1996
Mass function 'f(M1)' 5±0.1 (M) Casares1995a Harlaftis1996
BH mass (M1) 5.5 – 8.8 (M) Ioannou2004
Mass ratio (q=M/M1) 0.04±0.01 Harlaftis1996
Inclination angle (i) 54 – 60 (deg) Ioannou2004
Rot. broadening (v sini) 86±8 (km/s) Casares1995a Harlaftis1996

Optical/NIR magnitudes

Mag. Outburst (AB) Wagner1988 Charles1988
Mag. Quiescence (AB) Callanan1991 Beekman1996
R I J H Ks
=21.3±0.2 =20.2±0.2 =19±0.2 =18.37±0.03 =18.9±0.2
Scroll to zoom. Set survey image in Controls
Default image: DSS2 Red
GS 2000+251 in Simbad
Finding charts orientation:North up, East left
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Object marked with lines

Comparison stars reference: Callanan1991

Finding chart
Finding chart
Finding chart
This research has made use of NASA's Astrophysics Data System (ADS) and the SIMBAD database operated at CDS (Strasbourg, France)
Please acknowledge the use of this catalogue in any published work you derive from it.