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

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ID# 36

Swift J0840.7-3516

GRB 200205A

Candidate UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 08:40:40.94  -35:16:25.1                      [ICRS]

ℓ                      b [deg]                            [deg] 256.281083  04.017002

Year of discovery: 2020

(Evans2020)

Basic data

Location in Globular Cluster
Type of accretor	--	Transient
Distance [kpc] (other distances)	assumed 8	CotiZelati2021
z [kpc]	0.56	CotiZelati2021
Orbital period (Porb) [min]
Porb determination method
Thermonuclear X-ray burst
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	9.91E-10	CotiZelati2021
NH [x1022 cm-2]	0.46+0.13-0.10	CotiZelati2021
E(B-V) [mag]
Magnitude	R=16.3±0.1 qr=21	Melandri2020 CotiZelati2021
Proposed companion	CO WD (Opt spec)	CotiZelati2021

NOTES

CotiZelati2021 reported a radio non-detection during quiescence (5.5 and 9 GHz).

Spectral data

UV
Optical	in quiescence: C III+O II λλ4638-4710, C II+O II λλ6565-6620, He I λλ7050-7130, C II λλ7210-7270 emission lines	CotiZelati2021
X-ray	Possible absorption feature at ~3.4 keV (Fe K ?)	Shidatsu2021

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex CotiZelati2021 Melandri2020 Mazaeva2020 Malesani2020
UVW2 = 17.02±0.10 (Vega), qr~21 (Vega), R=16.3±0.1, I=16.8±0.1, r'=19.70±0.06, r=17.7±0.1

Aladin finding chart

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

Swift J0840.7-3516 in Simbad

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References to finding charts

CotiZelati2021