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

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ID# 15

4U 1916-053

XB 1916-05, XB 1916-053, 4U 1915-05, V1405 Aql

Confirmed UCXB

RA                 Dec     [hh:mm:ss.ss]          [dd:mm:ss.ss] 19:18:47.87  -05:14:17.09                      [ICRS]

ℓ                      b [deg]                            [deg] 031.357765  -08.463592

Year of discovery: 1972

(Giacconi1972)

Basic data

Location in Globular Cluster
Type of accretor	NS	Persistent
Distance [kpc] (other distances)	5.8±0.3(H), 7.6±0.4(He)	Galloway2020 Smale1988Chelovekov2017
z [kpc]	-1.12	Galloway2020
Orbital period (Porb) [min]	49.75±0.16	Walter1982White1982a
Porb determination method	X-ray dips
Thermonuclear X-ray burst	short-B	Becker1977
Peak X-ray flux [erg s-1 cm-2] (2 - 10 keV)	5.57E-10	Iaria2006
NH [x1022 cm-2]	0.55±0.04	Iaria2021
E(B-V) [mag]
Magnitude	V=20.99±0.05	Grindlay1987
Proposed companion	He-rich donor (Optical spectrum)	Nelemans2006

NOTES

Using a baseline of 40 years, Iaria2021 derived an orbital period derivative of ~1.4E-11 s/s. Moreover, they detected a periodic modulation in the orbital ephemeris that they explained as the presence of a third body orbiting around the binary system. The source shows a positive (~3028 s; Grindlay1988) and a negative (~2979 s; Retter2002) superhump, which suggest the presence of a precessing elliptic accretion disk tilted with respect to the equatorial plane of the system. A burst oscillation at ~270 Hz was discovered in a single burst observed by RXTE in August 1998 (Galloway2001).

Spectral data

UV
Optical	He I, He II, N II and N III lines	Nelemans2006
X-ray	Fe XXV Kα (~6.65keV), FeXXVI Kα (~6.95keV) absorption lines Ne X Kα (~1.02 keV), Mg XII Kα (~1.47 keV), Si XIV Kα (~2 keV), S XVI Kα (~2.61 keV) absorption lines O VIII K (~0.87 keV) absorption edge; Fe XXV Kβ (~7.79 keV), Fe XXVI Kβ (~8.19 keV) absoprtion lines Si XIV Kα (~2.37 keV), Ca XX Kα (~4.10 keV) absorption lines	Boirin2004 Iaria2006 Gambino2019 Iaria2021

Peak Optical/NIR magnitudes

If the system is transient, quiescent magnitudes are indicated with a "q" superindex Grindlay1987
V=20.99±0.05, B=21.4±0.05, U=20.88±0.05

Aladin finding chart

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4U 1916-053 in Simbad

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Pan-STARRS1 finding chart

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References to finding charts

Gottwald1991