Aquila X-1 (frequently abbreviated to Aql X-1) is a low-mass x-ray binary (LMXB) and the most luminous X-Ray source in the constellation Aquila. It was first observed by the satellite Vela 5B which detected several outbursts from this source between 1969 and 1976.[4] Its optical counterpart is variable, so it was named V1333 Aql according to the IAU standards. The system hosts a neutron star that accretes matter from a main sequence star of spectral type K4.[3] The binary's orbital period is 18.9479 hours.[1]
 A visual band light curve for Aquila X-1 during a July 1996 outburst, adapted from Garcia et al. (1999)[1] | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 11m 16.05720s[2] |
| Declination | +00° 35′ 05.8767″[2] |
| Characteristics | |
| Spectral type | K4[3] |
| Variable type | LMXB[4] |
| Other designations | |
| Database references | |
| SIMBAD | data |
The neutron star radiation flux is slightly variable due to the nuclear burning of the accreted helium on the surface.[6]
References
edit- ^ a b Garcia, Michael R.; Callanan, Paul J.; McCarthy, John; Eriksen, Kristoffer; Hjellming, Robert M. (June 1999). "Aquila X-1 in Outburst and Quiescence". The Astrophysical Journal. 518 (1): 422–427. arXiv:astro-ph/9901075. Bibcode:1999ApJ...518..422G. doi:10.1086/307283. S2CID 14797125. Retrieved 22 October 2021.
- ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b Mata Sánchez, D.; et al. (2017), "The donor of Aquila X-1 revealed by high-angular resolution near-infrared spectroscopy", Monthly Notices of the Royal Astronomical Society Letters, 464 (1): L41–L45, arXiv:1609.00392, Bibcode:2017MNRAS.464L..41M, doi:10.1093/mnrasl/slw172, S2CID 118355519.
- ^ a b Campana, S.; et al. (2013), "Mining the Aql X-1 long term X–ray light curve", Monthly Notices of the Royal Astronomical Society, 432 (2): 1695–1700, arXiv:1304.4033, Bibcode:2013MNRAS.432.1695C, doi:10.1093/mnras/stt604, S2CID 118473178.
- ^ "X Aql X-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-21.
{{cite web}}: CS1 maint: postscript (link) - ^ Mancuso, G. C.; Altamirano, D.; Méndez, M.; Lyu, M.; Combi, J. A. (2021), "Drifts of the marginally stable burning frequency in the X-ray binaries 4U 1608–52 and Aql X–1", Monthly Notices of the Royal Astronomical Society, 502 (2): 1856–1863, arXiv:2102.01181, doi:10.1093/mnras/stab159
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