Ellipsoidal Variations in the Soft X-Ray Transient AQL X-1

Details Ellipsoidal Variations in the Soft X-Ray Transient AQL X-1 Ellipsoidal Variations in the Soft X-Ray Transient AQL X-1

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.4308y&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #43.08; Bulletin of the American Astronomical Society, Vol. 30, p.1314

Astronomy and Astrophysics

Astronomy

Scientific paper

We have obtained 7 nights of R and I band CCD photometry of the soft X-ray transient Aql X-1. The data were obtained in 1998 June with the 2.1m telescope at McDonald Observatory under good conditions (dark time, 1--2 arcsec seeing). Aql X-1 was in a quiescent state throughout the observations. The images clearly show that a nearby, faint star is blended with Aql X-1. The data were therefore reduced with the point--spread function fitting routines in IRAF/DAOPHOT. We find the amplitude of the variations to be very small. The small amplitude of the ellipsoidal variations places a tight constraint on the inclination of the binary system.

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