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

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ID# 45

1RXS J180408.9-342058

Candidate UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 18:04:08.37   -34:20:51.19                      [ICRS]

ℓ                      b [deg]                            [deg] 357.297382  -06.125046

Year of discovery: 1990

(Voges1999)

Basic data

Location in Globular Cluster
Type of accretor	NS	Transient
Distance [kpc] (other distances)	<5.8 (He)	Chenevez2012 Chelovekov2017
z [kpc]	-0.62	Chenevez2012
Orbital period (Porb) [min]
Porb determination method
Thermonuclear X-ray burst	Short-B	Chenevez2012Wijnands2017Fiocchi2019Marino2019
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	1.97E-09	Degenaar2016
NH [x1022 cm-2]	0.48±0.02	Degenaar2016
E(B-V) [mag]
Magnitude	V=17.71±0.02	Baglio2016
Proposed companion	He rich companion? (optical spectra)	Baglio2016

NOTES

Tse2021 detect Millihertz QPOs with frequencies in the range 5-8 mHz, driven by thermonuclear burning.

Spectral data

UV
Optical	Tentative He II λ4686 emission line	Baglio2016
X-ray	N VII (~0.5 keV) O VII (~0.57 keV), O VIII (~0.65 keV) reflection lines, F Kα (~6.4 keV)	Ludlam2016Degenaar2016

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex Baglio2016
B=18.03 ± 0.03, V=17.71 ± 0.02,R=17.24 ± 0.03,17.03 ± 0.06, g=17.84 ± 0.05,r=17.38 ± 0.03,i=17.02 ± 0.03,J=15.79 ± 0.12,K=14.68 ± 0.26, (UVOT)b=17.22 ± 0.08,u=16.45 ± 0.06,uvw1=16.90 ± 0.07,uvm2=17.86 ± 0.12,uvw2=17.58 ± 0.08

Aladin finding chart

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Default image: DSS2 Red

1RXS J180408.9-342058 in Simbad