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

« Previous BHT   Next BHT »

ID# 9

H 1705-250

N Oph 1977 = V2107 Oph

(Yang2012)

RA     (ICRS)     DEC [hh:mm:ss.ss]          [dd:mm:ss.ss] 17:08:14.52  -25:05:30.15

ℓ                      b [deg]                            [deg] 358.5892354  09.05387073

Year of discovery: 1977  
(Kaluzienski1977Griffiths1977Griffiths1978)

# 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] [keV]	1.75E-08 [2-10]	Watson1978
Outburst magnitude (AB)	B=16.3±0.5	Longmore1977Griffiths1978
Quiescent magnitude (AB)	R∼20.9±0.2	Remillard1996Martin1995Yang2012
E(B-V) [mag]	0.5	Remillard1996

Dynamically confirmed BH

NOTES

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	Remillard1996Filippenko1997
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	Remillard1996Martin1995
Rot. broadening (v sini) [km/s]	<79	Harlaftis1997

Optical/NIR magnitudes

Mag. Outburst (AB) Longmore1977Griffiths1978
B=16.3±0.5
Mag. Quiescent (AB) Remillard1996Martin1995Yang2012
B+V (not AB)=21.5±0.1			R∼20.9±0.2

Aladin finding chart

Scroll to zoom. Set survey image in "Manage layers"
Default image: DSS2 Red

H 1705-250 in Simbad

---

Pan-STARRS1 finding chart

Click to enlarge in new tab/window