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

ID# 9

H 1705-250

N Oph 1977 = V2107 Oph

RA (h:m:s)  DEC (º:':")  J2000:
17:08:15.52 -25:05:30.15
( Yang2012 )

Galactic l (º)  b (º)  J2000:
358.5892354  +09.0538707

Year of discovery: 1977  
( Kaluzienski1977 Griffiths1977 Griffiths1978 )

# of outbursts after discovery:

Dynamically confirmed BH

Basic data

Distance (d) 8.6±2.1 (kpc) Jonker2004
d above plane (z) 1.4±0.3 (kpc) Jonker2004
Orbital period 12.51±0.03 (h) Remillard1996
Peak X-ray flux 1.75E-08
(erg/s/cm2) [keV] Watson1978
Outburst magnitude (AB) B=16.3±0.5 (mag) Longmore1977 Griffiths1978
Quiescent magnitude (AB) R∼20.9±0.2 (mag) Remillard1996 Martin1995 Yang2012
E(B-V) 0.5 (mag) Remillard1996
Notes H 1705-250: The B+V magnitude in quiescence was not transformed into AB system.

Dynamical parameters

Orbital period 12.51±0.03 (h) Remillard1996
Star's spectral type K3 – M0V Remillard1996 Filippenko1997
Star's radial velocity amplitude (K2) 448±4 (km/s) Filippenko1997
Mass function 'f(M1)' 4.9±0.1 (M) Filippenko1997
BH mass (M1) 4.9 – 7.9 (M) Harlaftis1997
Mass ratio (q=M/M1) ≤0.053 Harlaftis1997
Inclination angle (i) 48 – 80 (deg) Remillard1996 Martin1995
Rot. broadening (v sini) <79 (km/s) Harlaftis1997

Optical/NIR magnitudes

Mag. Outburst (AB) Longmore1977 Griffiths1978
Mag. Quiescence (AB) Remillard1996 Martin1995 Yang2012
R B+V (not AB)
∼20.9±0.2 =21.5±0.1
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H 1705-250 in Simbad
Finding charts orientation:North up, East left
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Object marked with lines

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.