Giant, Repeating, Optical Bursts from the Soft X-Ray Transient Aquila X-1

Details Giant, Repeating, Optical Bursts from the Soft X-Ray Transient Aquila X-1 Giant, Repeating, Optical Bursts from the Soft X-Ray Transient Aquila X-1

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...491l..89r&link_type=abstract

Astrophysical Journal Letters v.491, p.L89

Astronomy and Astrophysics

Astronomy

4

Stars: Binaries: Close, Stars: Neutron, Stars: Individual Constellation Name: Aquila X-1

Scientific paper

We report the detection of optical bursts during a low-amplitude, flat-topped eruption of the soft X-ray transient Aql X-1. The bursts had amplitudes between 0.17 and 0.35 mag and were variable in duration, some lasting longer than 78 s. On one night they recurred quasi-periodically at a mean interval of 1.01 hr. Regularly repeating optical bursts of this kind have not heretofore been observed from any X-ray binary. The accreting star in Aql X-1 is known to be a neutron star. We propose that the optical bursts are reprocessed type I X-ray bursts; that is, that they are thermonuclear flashes in the envelope of the neutron star.

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