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

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ID# 31

1RXS J171824.2-402934

RX J1718.4−4029

Candidate UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 17:18:24.14  -40:29:33.04                      [ICRS]

ℓ                      b [deg]                            [deg] 347.276837  -01.651634

Year of discovery: 1990

(Voges1999)

Basic data

Location in Globular Cluster
Type of accretor	NS	Persistent
Distance [kpc] (other distances)	4.7±0.3(H), 6.1±0.4(He)	Galloway2020 Kaptein2000IntZand2005
z [kpc]	-0.18	Galloway2020
Orbital period (Porb) [min]
Porb determination method
Thermonuclear X-ray burst	short-B	Kaptein2000
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	3.75E-12	ArmasPadilla2013b
NH [x1022 cm-2]	1.9±0.1	ArmasPadilla2013b
E(B-V) [mag]
Magnitude
Proposed companion

NOTES

Optical follow up of the X-ray position failed to identify an unambiguous counterpart (Motch1998, IntZand2009).

Spectral data

UV
Optical
X-ray	Featureless	IntZand2009ArmasPadilla2013b

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

1RXS J171824.2-402934 in Simbad

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References to finding charts

IntZand2009