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

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ID# 12

GS 1354-64

BW Cir

( Brocksopp2001 )

RA     [J2000]     DEC

[]          []

13:58:09.70  -64:44:05.80

ℓ                      b

[deg]                            [deg]

309.9774112  -02.77987343

Year of discovery: 1987  
( Makino1987 )

# of outbursts after discovery: 2

Basic data

Distance [kpc] ∼25 Casares2009
Distance to the plane (z) [kpc] ∼-1.21 Casares2009
Orbital period (Porb) [h] 61.068±0.002 Casares2009
Peak X-ray flux [erg s-1 cm-2]
Outburst magnitude (AB) V=16.9 Kitamoto1990
Quiescent magnitude (AB) i'∼20.2 Casares2009 Russell2015a
E(B-V) [mag] 1 Kitamoto1990

Dynamically confirmed BH


GS 1354-64 (BW Cir) is associated with MX 1353-64 which showed an outburst in 1971-1972. It showed another outburst in 1997 ( Remillard1997a ) and in 2015 ( Miller2015 ).
Gandhi2019 obtained a distance of 0.7+3.4-0.3 kpc from Gaia DR2 which is unconsistent with the lower limit derived in Casares2009 . If the Gaia distance were correct, it would open the possibility for Cen X-2 being BW Cir since its 1967 outburst would no longer be super-Eddington.

Dynamical parameters

Orbital period [h] 61.068±0.002 Casares2009
Star's spectral type G0 – 5III Casares2004
Star's radial velocity amplitude (K2) [km/s] 279±5 Casares2004 Casares2009
Mass function 'f(M1)' [M] 5.7±0.3 Casares2009
BH mass (M1) [M] ≥7.6±0.7 Casares2009
Mass ratio (q=M2/M1) 0.12+0.03-0.04 Casares2009
Inclination angle (i) [deg] ≤79 Casares2009
Rot. broadening (v sini) [km/s] 69±8 Casares2009

Optical/NIR magnitudes

Mag. Outburst (AB)
Mag. Quiescent (AB)
Casares2009 Russell2015a
V∼21.5 R=20.71±0.03
Aladin finding chart
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Default image: DSS2 Red
GS 1354-64 in Simbad

Finding charts

Orientation: North up, East left. Object marked
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Finding chart reference: Casares2009

Finding chart
Finding chart

Comparison stars (AB mag)

BA=20.10±0.04 VA=18.44±0.02 RA=17.60±0.03 IA=17.03±0.03
BB=19.65±0.04 VB=18.60±0.02 RB=17.99±0.04 IB=17.62±0.04
BC=20.38±0.05 VC=18.95±0.02 RC=18.17±0.04 IC=17.68±0.03
BD=19.94±0.03 VD=18.28±0.01 RD=17.42±0.02 ID=16.74±0.02
BE=19.37±0.02 VE=18.24±0.01 RE=17.63±0.02 IE=17.21±0.02

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.

Last modified: 27 August 2021.