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

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ID# 7

3A 0620-003

N Mon 1975 = V616 Mon

(Gallo2006)

RA     (ICRS)     DEC [hh:mm:ss.ss]          [dd:mm:ss.ss] 06:22:44.50  -00:20:44.72

ℓ                      b [deg]                            [deg] 209.9563081  -06.53987555

Year of discovery: 1975  
(Elvis1975)

# of outbursts after discovery: 1

Basic data

Distance [kpc]	1.06±0.1	Cantrell2010
Distance to the plane (z) [kpc]	-0.11±0.01	Cantrell2010
Orbital period (Porb) [h]	7.752340±2E-06	GonzalezHernandez2014
Peak X-ray flux [erg s-1 cm-2] [keV]	2.65E-06 [2-10]	Warwick1981
Outburst magnitude (AB)	V∼11.1	Robertson1976
Quiescent magnitude (AB)	V=18.23±0.04	Cantrell2010Gelino2001Froning2001
E(B-V) [mag]	0.35	Hynes2005

Dynamically confirmed BH

NOTES

3A 0620-003 showed an outburst in 1917 detected in plate scales prior to its detection in X-rays in 1975 (Eachus1976). A period derivative of -0.60±0.08 ms/yr has been measured (GonzalezHernandez2014). Gandhi2019 obtained a distance of 1.72+1.02-0.47 kpc from Gaia DR2.

Dynamical parameters

Orbital period [h]	7.752340±2E-06	GonzalezHernandez2014
Star's spectral type	K2 – 7V	Orosz1994
Star's radial velocity amplitude (K2) [km/s]	437±2	GonzalezHernandez2010
Mass function 'f(M1)' [M☉]	2.79±0.04	GonzalezHernandez2010
BH mass (M1) [M☉]	6.6±0.3	Cantrell2010
Mass ratio (q=M2/M1)	0.074±0.006	Orosz1994
Inclination angle (i) [deg]	51±0.9	Cantrell2010

Optical/NIR magnitudes

Mag. Outburst (AB) Robertson1976
B∼11.3	V∼11.1
Mag. Quiescent (AB) Cantrell2010Gelino2001Froning2001
B=19.32±0.04	V=18.23±0.04		R=17.12±0.04
	I=17.01±0.04
J=16.5±0.1	H=16.23±0.02

Aladin finding chart

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3A 0620-003 in Simbad

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Pan-STARRS1 finding chart

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Finding charts

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