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

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ID# 21

HETE J1900.1–2455

Short period LMXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 19:00:09.77  -24:54:04                      [ICRS]

ℓ                      b [deg]                            [deg] 011.324799  -12.868715

Year of discovery: 2005

(Vanderspek2005)

Basic data

Location in Globular Cluster
Type of accretor	NS AMXP (377.29 Hz / 2.65 ms)	Transient (Long outburst) Kaaret2006
Distance [kpc] (other distances) Gaia [kpc]	2.9±0.1(H), 3.8(He) 3.5+1.7-3.5	Galloway2020 Suzuki2007Galloway2008 Arnason2021
z [kpc]	-0.85	Galloway2020
Orbital period (Porb) [min]	83.2543±0.001	Kaaret2006
Porb determination method	X-ray pulsation
Thermonuclear X-ray burst	Short-B	Vanderspek2005Suzuki2007Papitto2013Galloway2020
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	3.92E-10	Papitto2013
NH [x1022 cm-2]	0.105	Papitto2013
E(B-V) [mag]
Magnitude	V=18.09±0.03	Steeghs2005b
Proposed companion

NOTES

The source showed intermittent pulsations, detected only sporadically after 2 months of its outburst (e.g., Patruno2012). Elebert2007 measured a modulation in the R-band light curves that might be due to superhumps. The source was detected at a net count rate of (2.36 ± 0.03)E-3 count/s during quiescence in 2016 April (Degenaar2017). QPOs with a single peak at 883 Hz (Kaaret2006) and burst oscillation at ~376 Hz (Watts2009).

Spectral data

UV
Optical	Hα, He II λ4686, Bowen blend of N III and C III Broad He II λ4686 emission line (the spectrum is contaminated by a nearby field star, limiting the detection of Balmer emission components. However, such Balmer emission is at most very weak).	Elebert2007 Steeghs2005b
X-ray	Fe Kα (~6.6 keV), excess at ~1 keV (Fe-Lα and/or Ne-Kα)	Papitto2013

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex Elebert2007 Fox2005 Steeghs2005b Steeghs2005
R=17.91±0.05,V=18.00±0.04, B=17.92±0.04, R~18.4, V=18.09±0.03, R=18.02±0.03, I=17.88±0.02, J=17.6±0.2

Aladin finding chart

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HETE J1900.1–2455 in Simbad

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Pan-STARRS1 finding chart

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References to finding charts

Elebert2007