Discovery of a 19-hour period in Aquila X-1

Details Discovery of a 19-hour period in Aquila X-1 Discovery of a 19-hour period in Aquila X-1

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251l..11c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. L11-L13.

Astronomy and Astrophysics

Astrophysics

34

Accretion Disks, Light Curve, X Ray Binaries, Charge Coupled Devices, Neutron Stars, Stellar Spectrophotometry

Scientific paper

The discovery of a 19-hour periodic modulation V1333 Aql, the optical counterpart of the low-mass X-ray binary Aquila X-1 is reported, which probably represents the orbital period of the system. The observations were made during the five-month long active state of this recurrent transient source in 1990. The modulation is approximately sinusoidal, has a peak-to-peak amplitude of 0.4 magnitude in V and is superposed onto a variable noise level.

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