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

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ID# 35

AX J1538.3-5541

ChI J153818-5541_1, J1538-5542, AX J153818-5541

Candidate UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 15:38:14.00  -55:42:13.6                      [ICRS]

ℓ                      b [deg]                            [deg] 324.945782  -00.130139

Year of discovery: 1998

(Sugizaki2001Degenaar2012d)

Basic data

Location in Globular Cluster
Type of accretor	--	Persistent (Quasi-persistent)
Distance [kpc] (other distances)	assumed 8	Degenaar2012d
z [kpc]	-0.02	Degenaar2012d
Orbital period (Porb) [min]
Porb determination method
Thermonuclear X-ray burst
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	2.57E-11	Degenaar2012d
NH [x1022 cm-2]	7.7±0.5	Degenaar2012d
E(B-V) [mag]
Magnitude	K=18	Anderson2014
Proposed companion

NOTES

Kennea2007 reported a possible orbital period of 1.23±0.05 days, from X-ray timing analysis, that couldn't be confirmed by Degenaar2012d after analysing 14 days of X-ray data.

Spectral data

UV
Optical
X-ray

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex Anderson2014
J > 21.9, H > 19.5, K=18

Aladin finding chart

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

AX J1538.3-5541 in Simbad