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

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1E 1603.6+2600 in Simbad

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Pan-STARRS1 finding chart

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References to finding charts

Hakala1998