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

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ID# 27

4U 1822-00

4U 1823-00, 4U 1822-000

Candidate UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 18:25:22.02  -00:00:43.0                      [ICRS]

ℓ                      b [deg]                            [deg] 029.939078  05.792617

Year of discovery: 1972

(Giacconi1972)

Basic data

Location in Globular Cluster
Type of accretor	NS	Persistent
Distance [kpc] (other distances)	13 4	Asai2016 Christian1997Shahbaz2007
z [kpc]	1.31	Asai2016
Orbital period (Porb) [min]
Porb determination method
Thermonuclear X-ray burst	Short-B	Asai2016
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	5.80E-10	Hertz1984
NH [x1022 cm-2]	0.97±0.18	Juett2005
E(B-V) [mag]
Magnitude	r'=21.58±0.08	Wang2004
Proposed companion

NOTES

Shahbaz2007 estimated an orbital period of 191±8 min from optical modulations. This long orbital period would imply that the source is not ultracompact, however, the authors claim that the modulation is biased because the dataset covers less than twice the period. Radio flux < 0.4 mJy (6 cm; Grindlay1986). IR fluxes: 0.3 Jy (12μm), 0.2 Jy (25μm), 0.6 Jy (60μm), < 4.3 Jy (100μm; Smith1990). Radio flux density < 6 mJy (2 cm; Duldig1979).

Spectral data

UV
Optical	Featureless	Nelemans2006
X-ray	Featureless	Juett2005

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex Chevalier1985 Wang2004
V = 22, r'=21.58±0.08

Aladin finding chart

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4U 1822-00 in Simbad

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Pan-STARRS1 finding chart

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References to finding charts

Wang2004Gottwald1991