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

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ID# 30

AX J1754.2-2754

Candidate UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 17:54:14.5    -27:54:35.6                      [ICRS]

ℓ                      b [deg]                            [deg] 001.853974  -01.099765

Year of discovery: 1999

(Sakano2002)

Basic data

Location in Globular Cluster
Type of accretor	NS	Persistent (Quasi-persistent)
Distance [kpc] (other distances)	6.6±0.3(H), 9.2±0.4(He)	Chelovekov2007 Chenevez2017Chelovekov2011Chelovekov2017
z [kpc]	-0.18	Chelovekov2007
Orbital period (Porb) [min]
Porb determination method
Thermonuclear X-ray burst	Short-B IB	Chelovekov2007 Chenevez2017
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	9.55E-12	ArmasPadilla2013b
NH [x1022 cm-2]	2.93±0.06	ArmasPadilla2013b
E(B-V) [mag]
Magnitude	Ks=18.12±0.15	Shaw2017
Proposed companion

NOTES

Given its low X-ray luminosity, the status of the source can only be verified via pointed X-ray observations (Bahramian2022). Every time the source was pointed at, it was detected, except for a Chandra observation in 2008 (Bassa2008). Although its orbital period is unknown, this source is a candidate UCXB due to its low X-ray luminosity, the type I X-ray bursts, and its low absolute optical magnitude (Bassa2008).

Spectral data

UV
Optical
X-ray

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex Bassa2008 Shaw2017 Zolotukhin2015
i > 23.5, Ks=18.12±0.15, J > 19.7, H > 18.7, K > 18

Aladin finding chart

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AX J1754.2-2754 in Simbad

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Pan-STARRS1 finding chart

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References to finding charts

Chelovekov2007 Shaw2017