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

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ID# 47

XMMU J181227.8-181234

XTE J1812-182

Candidate UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 18:12:27.8    -18:12:34                      [ICRS]

ℓ                      b [deg]                            [deg] 012.357731  00.033671

Year of discovery: 2003

(Cackett2006)

Basic data

Location in Globular Cluster
Type of accretor	NS	Transient
Distance [kpc] (other distances)	20.9±1.2 (H), 27.2±1.5 (He)	Galloway2020 Goodwin2019
z [kpc]	0.02	Galloway2020
Orbital period (Porb) [min]
Porb determination method
Thermonuclear X-ray burst	short-B	Goodwin2019
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	2.85E-09	Cackett2006
NH [x1022 cm-2]	12.8±0.3	Cackett2006
E(B-V) [mag]
Magnitude
Proposed companion

NOTES

Based on the measured burst fluence and the average recurrence time of ~1.4 h of the Type I X-ray bursts detected during the 2008 outburst, Goodwin2019 deduced that the source is accreting almost pure He fuel.

Spectral data

UV
Optical
X-ray	Fe Kα (~6.5 keV)	Goodwin2019

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex

Aladin finding chart

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

XMMU J181227.8-181234 in Simbad

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Pan-STARRS1 finding chart

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References to finding charts

Cackett2006