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

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ID# 29

RX J1709.5-2639

XTE J1709-267, 1RXS J170930.2-263927

Candidate UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 17:09:30.4  -26:39:19.9                      [ICRS]

ℓ                      b [deg]                            [deg] 357.472538  07.911726

Year of discovery: 1990

(Voges1999)

Basic data

Location in Globular Cluster	NGC 6293
Type of accretor	NS	Transient
Distance [kpc] (other distances)	9.192 +0.282-0.274	Baumgardt2021 Harris1996Harris2010Jonker2004aLee2006Galloway2020
z [kpc]	1.27	Baumgardt2021
Orbital period (Porb) [min]
Porb determination method
Thermonuclear X-ray burst	Short-B	Cocchi1998
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	9.10E-10	Ludlam2017
NH [x1022 cm-2]	0.29±0.01	Degenaar2013
E(B-V) [mag]	0.36±0.04	Harris2010
Magnitude	R=20.5±0.1 qR=22.24±0.03	Jonker2004a
Proposed companion	O/Ne WD (X-ray spectral modelling)	Jonker2003

NOTES

Although the orbital period is unknown, Jonker2003 found an excess emission at ~0.6 keV that makes the source an UCXB candidate.

Spectral data

UV
Optical
X-ray	Excess emission at 0.6 keV (O and/or Fe, enhanced Ne/O) Fe Kα (~6.5 keV)	Jonker2003 Ludlam2017

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex Jonker2004a Jonker2003 Wiersema2016
R=20.5±0.1, R=22.24±0.03 (qui), qmV < 20.5, V=17.9

Aladin finding chart

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RX J1709.5-2639 in Simbad

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Pan-STARRS1 finding chart

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References to finding charts

Jonker2004a