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

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ID# 9

H 1705-250

N Oph 1977 = V2107 Oph

( Yang2012 )

RA     [J2000]     DEC

[]          []

17:08:15.52  -25:05:30.15

ℓ                      b

[deg]                            [deg]

358.5892354  +09.05387073

Year of discovery: 1977  
( Kaluzienski1977 Griffiths1977 Griffiths1978 )

# of outbursts after discovery:

Basic data

Distance [kpc] 8.6±2.1 Jonker2004
Distance to the plane (z) [kpc] 1.4±0.3 Jonker2004
Orbital period (Porb) [h] 12.51±0.03 Remillard1996
Peak X-ray flux [erg s-1 cm-2]
Outburst magnitude (AB) B=16.3±0.5 Longmore1977 Griffiths1978
Quiescent magnitude (AB) R∼20.9±0.2 Remillard1996 Martin1995 Yang2012
E(B-V) [mag] 0.5 Remillard1996

Dynamically confirmed BH


H 1705-250: The B+V magnitude in quiescence was not transformed into AB system.

Dynamical parameters

Orbital period [h] 12.51±0.03 Remillard1996
Star's spectral type K3 – M0V Remillard1996 Filippenko1997
Star's radial velocity amplitude (K2) [km/s] 448±4 Filippenko1997
Mass function 'f(M1)' [M] 4.9±0.1 Filippenko1997
BH mass (M1) [M] 4.9 – 7.9 Harlaftis1997
Mass ratio (q=M2/M1) ≤0.053 Harlaftis1997
Inclination angle (i) [deg] 48 – 80 Remillard1996 Martin1995
Rot. broadening (v sini) [km/s] <79 Harlaftis1997

Optical/NIR magnitudes

Mag. Outburst (AB)
Longmore1977 Griffiths1978
Mag. Quiescent (AB)
Remillard1996 Martin1995 Yang2012
B+V (not AB)=21.5±0.1 R∼20.9±0.2
Aladin finding chart
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H 1705-250 in Simbad

Pan-STARRS1 finding chart

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PS1 Finding chart PS1 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.

Last modified: 27 August 2021.