On the nature of the outbursts from AQL X-1

Details On the nature of the outbursts from AQL X-1 On the nature of the outbursts from AQL X-1

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..51..501m&link_type=abstract

Astrophysics and Space Science, vol. 51, no. 2, Oct. 1977, p. 501-506.

Astronomy and Astrophysics

Astronomy

3

Astronomical Models, X Ray Sources, X Ray Spectra, Binary Stars, Energy Spectra, Neutron Stars, Radiant Flux Density, Stellar Mass Accretion, Ternary Systems, X Ray Astronomy

Scientific paper

Data on two observed hard-X-ray outbursts from Aql X-1 are analyzed. The hard X-ray spectrum of the source is examined, the shape of this spectrum is discussed, and evidence is presented which indicates that the first transient even in Aql X-1 may have been observed as early as April 1966. The distance to Aql X-1 is estimated to be less than 4 to 6 kpc. Two models are considered for Aql X-1, the first involving a binary system with a neutron star in a highly eccentric orbit about a normal companion and the second involving a triple system in which two normal stars form a long-period binary and have a discrete plasma bridge cyclically traversed by the X-ray source.

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