Aquila X-1

Aquila X-1

A visual band light curve for Aquila X-1 during a July 1996 outburst, adapted from Garcia et al. (1999)
Observation data
Epoch J2000.0      Equinox ICRS
Constellation Aquila
Right ascension 19h 11m 16.05720s
Declination +00° 35′ 05.8767″
Characteristics
Spectral type K4
Variable type LMXB
Details
Mass>1.2 M☉
Mass<0.76 M☉
Other designations
V1333 Aql, 2MASS J19111604+0035058
Database references
SIMBADdata

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. 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. The binary's orbital period is 18.9479 hours.

Aquila X-1 is an atoll source. The neutron star radiation flux is slightly variable due to the nuclear burning of the accreted helium on the surface.

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. ↑ Muno, Michael P.; Remillard, Ronald A.; Chakrabarty, Deepto (2002). "How do Z and Atoll X-Ray Binaries Differ?". The Astrophysical Journal. 568: L35–L39. arXiv:astro-ph/0111370. doi:10.1086/340269.
  7. ↑ 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