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

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ID# 24

4U 1812-12

Short period LMXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 18:15:06.15    -12:05:46.7                      [ICRS]

ℓ                      b [deg]                            [deg] 018.032721  02.397809

Year of discovery: 1972

(Giacconi1972)

Basic data

Location in Globular Cluster
Type of accretor	NS	Persistent
Distance [kpc] (other distances)	2.3(H), 3(He)	Galloway2020 Jonker2004Chelovekov2011
z [kpc]	0.10	Galloway2020
Orbital period (Porb) [min]	114	ArmasPadilla2022
Porb determination method	Optical modulation
Thermonuclear X-ray burst	Short-B	Murakami1983Tarana2006 IntZand2019Galloway2020
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	3.80E-10	Muno2005b
NH [x1022 cm-2]	1.50	Tarana2006Barret2003
E(B-V) [mag]
Magnitude	r=22.7	ArmasPadilla2020
Proposed companion	evolved main-sequence star with a low fraction of photospheric hydrogen as donor star (Optical spectra, Bursts)	ArmasPadilla2022

NOTES

Spectral data

UV
Optical	Featureless	ArmasPadilla2022
X-ray

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex ArmasPadilla2020 ArmasPadilla2022 Bassa2006
r=22.7, g=25.3, rs = 23.17 ± 0.02, is = 21.93 ± 0.01, zs = 21.28 ± 0.01, R= 22.15

Aladin finding chart

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4U 1812-12 in Simbad

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Pan-STARRS1 finding chart

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References to finding charts

ArmasPadilla2020