All-sky monitor observations of flares from Aquila X-1

Details All-sky monitor observations of flares from Aquila X-1 All-sky monitor observations of flares from Aquila X-1

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976stin...7633102k&link_type=abstract

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Astronomy and Astrophysics

Astronomy

All Sky Photography, Flares, X Ray Astronomy, Ariel 5 Satellite, Binary Stars, Crab Nebula, Dwarf Stars, Novae

Scientific paper

The All-Sky Monitor on Ariel 5 has observed the Aquila-Serpens region on a quasi-continuous basis since launch in 1974 October. During this time Aql X-1 exhibited major flares in 1975 June and 1976 June, with the measured X-ray intensities increasing more than an order of magnitude to approximately that measured from the Crab nebula, and remaining above the experiment threshold (approximately 0.1 x s crab) for almost two months in both instances. These outbursts resemble the X-ray light curves of transient sources such as A0620-00 and are interpreted in terms of episodic accretion in a dwarf nova-like binary. Combination of the epoch of phase minimum for the 1.3d period (1976) with the 1975 data yields a value of P = 1.28d + or - 0.02d with a corresponding modulation of approximately 3% (3-6 keV). Modulation at this period is not apparent in the 1976 data, with an upper limit of 2% during that time.

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