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)[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
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.[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]

  1. ^ a b Cite error: The named reference Garcia was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference MNRAS2017 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference campana2013 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  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