Aquila X-1

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Aquila X-1
V1333AqlLightCurve.png
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
V1333 Aql, 2MASS J19111604+0035058 [5]
Database references
SIMBAD data

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]

The neutron star radiation flux is slightly variable due to the nuclear burning of the accreted helium on the surface. [6]

References

  1. 1 2 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.
  2. 1 2 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.
  3. 1 2 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.
  4. 1 2 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.
  5. ↑ "X Aql X-1". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-02-21.
  6. ↑ 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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