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

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ID# 39

1RXS J170854.4-321857

4U 1705-32

Candidate UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 17:08:54.27  -32:19:57.13                      [ICRS]

ℓ                      b [deg]                            [deg] 352.780023  04.671897

Year of discovery: 1972

(Giacconi1972)

Basic data

Location in Globular Cluster
Type of accretor	NS	Persistent (Quasi-persistent)
Distance [kpc] (other distances)	<4.4(H), <5.7(He)	Galloway2020 IntZand2005
z [kpc]	0.46	Galloway2020
Orbital period (Porb) [min]
Porb determination method
Thermonuclear X-ray burst	IB	IntZand2004IntZand2005
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	4.57E-11	ArmasPadilla2019b
NH [x1022 cm-2]	0.34±0.04	ArmasPadilla2019b
E(B-V) [mag]
Magnitude	K > 20.1	Revnivtsev2013
Proposed companion

NOTES

Negoro2021 reported on possible period of enhanced activity from MAXI on March 2021.

Spectral data

UV
Optical
X-ray	Overabundances of Ne and Fe (~1 keV)	ArmasPadilla2019b

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex Revnivtsev2013
J > 20.8, H > 20.6, K > 20.1

Aladin finding chart

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

1RXS J170854.4-321857 in Simbad

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References to finding charts

Revnivtsev2013