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

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ID# 26

NGC 6652 B

CXOGLB J183544.5-325939

Candidate UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 18:35:44.54  -32:59:38.97                      [ICRS]

ℓ                      b [deg]                            [deg] 001.529081  -11.374830

Year of discovery: 1998

(Deutsch1998Heinke2001)

Basic data

Location in Globular Cluster	NGC 6652
Type of accretor	NS	Transient
Distance [kpc] (other distances)	9.464 +0.139-0.137	Baumgardt2021 Kuulkers2003Harris2010Chelovekov2011
z [kpc]	-1.87	Baumgardt2021
Orbital period (Porb) [min]
Porb determination method
Thermonuclear X-ray burst	Short-B	Intzand1998
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	7.52E-13	Stacey2012
NH [x1022 cm-2]	0.05	Coomber2011
E(B-V) [mag]	0.09±0.01	Harris2010
Magnitude	B = 20.4	Deutsch1998
Proposed companion	- MS (not compatible with Porb) or degenerate (not compatible with colors). - Early to mid G-type star. (- Geometry and observed parameter's arguments. - Optical spectrum)	Heinke2001 Paduano2021

NOTES

NGC 6652 B can only be separated from NGC 6652 A (XB 1832-330) by Chandra; then, properties such as bursts and activity (transient or persistent), have to be considered carefully, since they could belong to either source. Deutsch1998 identified an optical counterpart with NGC 6652 A and Deutsch2000 estimated an orbital period of 43.6 (+/-0.6) min, based in optical modulation (HST). But later, Heinke2001 associated that counterpart with NGC 6652 B from Chandra data. Engel2012 obtained a light curve that shows a lot of flickering and suggested that the orbital period reported by Deutsch2000 is spurious (this was also suggested by Heinke2001). Radio flux density = 79.2 ± 2.2 μJy (10 GHz; Paduano2021).

Spectral data

UV
Optical	H and He emission features (changing to absorption in ~2 hours), G-band, and metallic absorption lines (Fe, Mg, Na, O).	Paduano2021
X-ray

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex Deutsch1998 Paduano2021 Skottfelt2015
B = 20.4, V > 17.7, I = 18.72

Aladin finding chart

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Default image: DSS2 Red

NGC 6652 B in Simbad

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References to finding charts

Heinke2001Deutsch1998Engel2012Skottfelt2015