UltraCompCAT A Catalogue of Ultra-Compact and Short Orbital Period X-ray Binaries


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ID# 3

2S 0918-549

4U 0919-54

Confirmed UCXB

RA                 Dec    

[hh:mm:ss.ss]          [dd:mm:ss.ss]

09:20:26.95  -55:12:24.7

                     [ICRS]

ℓ                      b

[deg]                            [deg]

275.852936  -03.844515

Year of discovery: 1974

(Giacconi1974)

Basic data

Location in Globular Cluster
Type of accretor NS Persistent
Distance [kpc]
(other distances)
Gaia [kpc]
3.0±0.2 (H), 3.9±0.2 (He)

4.0
5.77+2.77-1.60
Galloway2020
Jonker2004IntZand2005b
VanDenEijnden2021

BailerJones2018
z [kpc] -0.26 Galloway2020
Orbital period (Porb) [min] 17.4±0.1 Zhong2011
Porb determination method Optical modulation
Thermonuclear X-ray burst Short-B
IB
Jonker2001b
IntZand2005
Peak X-ray flux [erg s-1 cm-2]
(2 - 10 keV)
1.12E-10 Juett2003b
NH [x1022 cm-2] 0.3 Juett2003b
E(B-V) [mag]
Magnitude V = 20.98±0.07 Chevalier1987
Proposed companion He WD; CO WD; ONe WD
(Burst modelling; optical spectrum; X-ray spectral modelling)
IntZand2005b Nelemans2004Nelemans2006 Juett2001


NOTES

Radio flux density < 20 μJy (5.5 GHz; VanDenEijnden2021. According to the authors, the source was not detected at radio frequencies; the radio luminosity < ~3E27 erg/s).
Fradio < 6 mJy (2 cm (14.7GHz); Duldig1979).

Spectral data

UV
Optical Featureless (see, however, Nelemans2004 and Nelemans2006 for a marginal CO detection). Nelemans2004Nelemans2006
X-ray Ne (0.7 keV) Juett2001

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex
Chevalier1987 Zhong2011
V = 20.98±0.07, B = 21.29±0.07, r' = 20.95±0.16
Aladin finding chart
Scroll to zoom. Set survey image in "Manage layers"
Default image: DSS2 Red
2S 0918-549 in Simbad

References to finding charts

Zhong2011Chevalier1987



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: 09 May 2023.