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

ID# 30

SAX J1819.3-2525

V4641 Sgr

RA (h:m:s)  DEC (º:':")  J2000:
18:19:21.58 -25:24:25.10
( Samus1999 )

Galactic l (º)  b (º)  J2000:
006.7740023  -04.7887355

Year of discovery: 1999  
( intZand1999 )

# of outbursts after discovery: 3

Dynamically confirmed BH

Basic data

Distance (d) 6.2±0.7 (kpc) MacDonald2014
d above plane (z) -0.52±0.06 (kpc) MacDonald2014
Orbital period 67.6152±0.0002 (h) Orosz2001
Peak X-ray flux 2.76E-07
(erg/s/cm2) [keV] Orosz2001
Outburst magnitude (AB) V=8.8 (mag) Orosz2001
Quiescent magnitude (AB) I=13.52±0.03 (mag) MacDonald2014 Orosz2001 MacDonald2014
E(B-V) 0.32 – 0.38 (mag) MacDonald2014
Notes SAX J1819.3-2525 (V4641 Sgr) showed a weak outburst in 2010, ( Yamaoka2010 ) and a complete outburst in 2015 ( Yoshii2015 ).

Dynamical parameters

Orbital period 67.6152±0.0002 (h) Orosz2001
Star's spectral type B9III Orosz2001
Star's radial velocity amplitude (K2) 211±3 (km/s) Orosz2001
Mass function 'f(M1)' 2.7±0.1 (M) Orosz2001
BH mass (M1) 6.4±0.6 (M) MacDonald2014
Mass ratio (q=M/M1) 0.63 – 0.70 MacDonald2014
Inclination angle (i) 72±4 (deg) MacDonald2014
Rot. broadening (v sini) 100.9±0.8 (km/s) MacDonald2014

Optical/NIR magnitudes

Mag. Outburst (AB) Orosz2001
Mag. Quiescence (AB) MacDonald2014 Orosz2001 MacDonald2014
=13.52±0.03 =13.66±0.03 ∼13.91±0.04 =14.86±0.05 =14.23±0.05
=12.83±0.05 =13.96±0.02 =13.73±0.02
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Default image: DSS2 Red
SAX J1819.3-2525 in Simbad
Finding charts orientation:North up, East left
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Object marked with lines

Comparison stars reference: MacDonald2014

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.