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

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ID# 6

M15 X-2

CXOU J212958.1+121002, NGC 7078 X-2

Confirmed UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 21:29:58.14   +12:10:01.52                      [ICRS]

ℓ                      b [deg]                            [deg] 065.012156  -27.311977

Year of discovery: 2000

(White2001)

Basic data

Location in Globular Cluster	M15/NGC 7078
Type of accretor	NS	Persistent
Distance [kpc] (other distances)	10.709 -0.096+0.095	Baumgardt2021 Harris2010Kuulkers2003Watkins2015
z [kpc]	-4.91	Baumgardt2021
Orbital period (Porb) [min]	22.5806±0.0002	Dieball2005
Porb determination method	UV modulation
Thermonuclear X-ray burst	Short-B IB	vanParadijs1990bSmale2001 Galloway2020
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	6.71E-11	White2001
NH [x1022 cm-2]	<0.034	White2001
E(B-V) [mag]	0.1±0.01	Harris2010
Magnitude	U=18.6	DeMarchi1994White2001
Proposed companion	C, He WD (UV SED modelling)	Dieball2005

NOTES

M15 X-2 could only be separated from AC211 by Chandra. The combined unresolved emission is known as 4U 2129+12 or 4U 2127+119. Although it is not clear which of the sources is the burster, it is believed to be M15 X-2 (White2001, Kuulkers2003). Although M15 X-2 is a persistent source, it has shown episodes of increased activity (Sivakoff2011, Pooley2013, Homan2022). The source was detected at 5 and 7 GHz during its 2011 increased activity period (Miller-Jones2011).

Spectral data

UV	Excess of flux (C IV λ1550 and He II λ1640 emission lines ?)	Dieball2005
Optical
X-ray	Featureless	White2001Koliopanos2021

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex DeMarchi1994White2001 Díaz-Sánchez2012
U=18.6, I < 20.5

Aladin finding chart

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Default image: DSS2 Red

M15 X-2 in Simbad

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Pan-STARRS1 finding chart

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References to finding charts

Dieball2005White2001