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
Scroll to zoom. Set survey image in "Manage layers"
Default image: DSS2 Red
4U 1812-12 in Simbad

Pan-STARRS1 finding chart

Click to enlarge in new tab/window

PS1 Finding chart PS1 Finding chart

References to finding charts

ArmasPadilla2020


This research has made use of NASA's Astrophysics Data System (ADS) and the SIMBAD database operated at CDS (Strasbourg, France)
Please acknowledge the use of this catalogue in any published work you derive from it.
Last modified: 09 May 2023.