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


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ID# 22

1E 1603.6+2600

UW CrB, MS 1603.6+2600, MS 1603+260

Short period LMXB

RA                 Dec    

[hh:mm:ss.ss]          [dd:mm:ss.ss]

16:05:45.8746   +25:51:45.2464

                     [ICRS]

ℓ                      b

[deg]                            [deg]

042.750438  46.778360

Year of discovery: 1990

(Gioia1990 )

Basic data
Location in Globular Cluster
Type of accretor NS Persistent
Distance [kpc]
(other distances)
 Gaia [kpc] 		Gaia 2.1 +0.7-1.2

2.6+0.8-1.3 		Arnason2021
Mukai2001Jonker2003aHakala1998Hakala2005
BailerJones2018
z [kpc] 1.53 Arnason2021
Orbital period (Porb) [min] 111.04 Morris1990
Porb determination method Optical eclipse
Thermonuclear X-ray burst short-B Hakala2005Mukai2001
Peak X-ray flux [erg s-1 cm-2]
(2 - 10 keV)		 4.19E-12 Jonker2003a
NH [x1022 cm-2] 0.15±0.03 Jonker2003a
E(B-V) [mag]
Magnitude R=19.4 Morris1990
Proposed companion


NOTES
Manson2012 report an upper limit of the change of the orbital period of |P| < 4.2E-11.
Optical bursts were suggested to arise from reprocessed type I X-ray bursts in the companion star (Hynes2004c) or in the accretion disc (Manson2012).

Spectral data
UV
Optical Hα, Hβ, He II λ4686 emission lines; He I and Ca II absorption lines Morris1990
X-ray Evidence for emission lines at ~0.5 keV and ~0.65 keV (N VII, O VIII Lyα ?) Hakala2005

Peak Optical/NIR magnitudes
If the system is transient, quiescent magnitudes are indicated with a "q" superindex
Morris1990 Monet2003 Gaia2020 SDSS_Release7
R~19.4, B=19.37, G=19.53±0.01, BP=19.52±0.05, RP=19.47±0.05, u=19.527±0.028, g=19.546±0.012, r=19.705±0.016, i=19.845±0.027, z=19.911±0.091
Aladin finding chart
Scroll to zoom. Set survey image in "Manage layers"
Default image: DSS2 Red
1E 1603.6+2600 in Simbad

Pan-STARRS1 finding chart

Click to enlarge in new tab/window

PS1 Finding chart PS1 Finding chart

References to finding charts

Hakala1998


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.