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
Scroll to zoom. Set survey image in "Manage layers"
Default image: DSS2 Red
GS 2000+251 in Simbad

Pan-STARRS1 finding chart

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PS1 Finding chart PS1 Finding chart

Finding charts

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

Finding chart
Finding chart
Finding chart


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

Last modified: 25 March 2024.