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

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ID# 49

1A 1744-361

XTE J1748–361, A1744-36

Candidate UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 17:48:13.15  -36:07:57.02                      [ICRS]

ℓ                      b [deg]                            [deg] 354.119972  -04.192072

Year of discovery: 1976

(Davison1976)

Basic data

Location in Globular Cluster
Type of accretor	NS	Transient
Distance [kpc] (other distances)	<7 (H), <9.1 (He)	Galloway2020 Bhattacharyya2006
z [kpc]	-0.67	Galloway2020
Orbital period (Porb) [min]
Porb determination method
Thermonuclear X-ray burst	Short-B	Emelyanov2001Bhattacharyya2006
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	1.4E-9	Gavriil2012
NH [x1022 cm-2]	0.41±0.01	Gavriil2012
E(B-V) [mag]
Magnitude
Proposed companion

NOTES

By measuring the spacing between two dip episodes observed by RXTE, Bhattacharyya2006 estimated an orbital period of 97±22 min. However, these dip episodes were separated by a data gap, thus not precluding a shorter period (Gavriil2012). The optical counterpart was identified during the 2004 outburst (Steeghs2004). Burst oscillations were detected at 530 Hz during the 2005 outburst (Bhattacharyya2006). The burst properties suggest H-poor fuel (Galloway2008).

Spectral data

UV
Optical
X-ray	Fe emission (~6 keV) and absorption (~8.4 keV) features Fe XXVI absorption line (6.96 keV)	Bhattacharyya2006b Gavriil2012

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

1A 1744-361 in Simbad

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References to finding charts

Emelyanov2001