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

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ID# 9

XTE J1807-294

Confirmed UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 18:06:59.8  -29:24:30                      [ICRS]

ℓ                      b [deg]                            [deg] 001.935298  -04.272579

Year of discovery: 2003

(Markwardt2003a)

Basic data

Location in Globular Cluster
Type of accretor	NS AMXP (190.63 Hz / 5.25ms)	Transient Markwardt2003a
Distance [kpc] (other distances)	assumed 8	Campana2003 Galloway2006aRiggio2008
z [kpc]	-0.60	Campana2003
Orbital period (Porb) [min]	40.0741±0.0005	Markwardt2003
Porb determination method	X-ray pulsation
Thermonuclear X-ray burst
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	1.19E-10	Campana2003
NH [x1022 cm-2]	0.46+0.03-0.02	Campana2003
E(B-V) [mag]
Magnitude	qV>24.3	DAvanzo2009
Proposed companion	(C or O dwarfs, He dwarf would require an unlikely low inclination ) (companion mass vs radius plane)	Falanga2005

NOTES

The source was not detected in quiescence with a 3σ upper limit on the count rate of 8E-4 counts/s (0.5-10 keV; Campana2005).

Spectral data

UV
Optical
X-ray	Featureless	Campana2003

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex DAvanzo2009
qV>24.3, qR>24.2, qJ>19.7

Aladin finding chart

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XTE J1807-294 in Simbad

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Pan-STARRS1 finding chart

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