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

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ID# 3

4U 1543-475

IL Lup

(Park2004)

RA     (ICRS)     DEC [hh:mm:ss.ss]          [dd:mm:ss.ss] 15:47:08.32  -47:40:10.80

ℓ                      b [deg]                            [deg] 330.9178710  05.42614694

Year of discovery: 1971  
(Giacconi1972Matilsky1972)

# of outbursts after discovery: 4

Basic data

Distance [kpc]	7.5±0.5	Jonker2004
Distance to the plane (z) [kpc]	0.7±0.05	Jonker2004
Orbital period (Porb) [h]	26.79377±0.00007	Orosz1998Orosz2003
Peak X-ray flux [erg s-1 cm-2] [keV]	9.42E-08 [2-10]	Park2004
Outburst magnitude (AB)	V=13.90	Saikia2021a
Quiescent magnitude (AB)	V=16.7	Orosz1998Chevalier1992Buxton2004
E(B-V) [mag]	0.5	Orosz1998

Dynamically confirmed BH

NOTES

4U 1543-475 have shown outbursts in 1984, 1992, 2002 and 2021 (Kitamoto1984,Harmon1992a,Miller2002,Negoro2021). The peak X-ray flux is taken from the 2002 outburst (Park2004). Gandhi2019 obtained a distance of 8.60+3.84-2.46 kpc from Gaia DR2. The 2021 outburst was brighter than the previous ones, perhaps super-Eddington, with Saikia2021a reporting outburst magnitudes ~1 mag brighter than previous outbursts when the system was still brightening.

Dynamical parameters

Orbital period [h]	26.79377±0.00007	Orosz1998Orosz2003
Star's spectral type	A2V	Orosz1998
Star's radial velocity amplitude (K2) [km/s]	124±4	Orosz1998
Mass function 'f(M1)' [M☉]	0.25±0.01	Orosz1998Orosz2003
BH mass (M1) [M☉]	8.4 – 10.4	Orosz1998Orosz2003
Mass ratio (q=M2/M1)	0.25 – 0.31	Orosz1998Orosz2003
Inclination angle (i) [deg]	20.7±1.5	Orosz1998Orosz2003
Rot. broadening (v sini) [km/s]	46±2	Orosz1998Orosz2003

Optical/NIR magnitudes

Mag. Outburst (AB) Saikia2021a
B=14.53	V=13.90	R=13.54	i’=13.60
Mag. Quiescent (AB) Orosz1998Chevalier1992Buxton2004
B=17.3	V=16.7
	I=16.1±0.1
J=16.04±0.05

Additional information

Light Curve by XB-NEWS (Russell2019)

Aladin finding chart

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4U 1543-475 in Simbad

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