The orbital light curve of aquila X-1

Details The orbital light curve of aquila X-1 The orbital light curve of aquila X-1

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..599..902r&link_type=abstract

X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. Edited by Nicholas E. White, Giuseppe Malaguti, and G

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X-Ray Binaries, Novae, Dwarf Novae, Recurrent Novae, And Other Cataclysmic Variables, X-Ray Sources, X-Ray Bursts, Neutron Stars, Cataclysmic Binaries, Symbiotic Stars

Scientific paper

The R-band light curve of the X-ray nova/neutron-star binary Aql X-1 is dominated by ellipsoidal variations when it is at quiescence, although the ellipsoidal variations are severely distorted and have unequal maxima. The peak-to-peak amplitude of the variations is ~ 0.25 mag. The orbital period measured from the ellipsoidal variations is consistent with the 18.95 hr period measured by Chevalier & Ilovaisky (1998); and the orbital inclination must be greater than 36°, and probably lies between 36° and 55°. During outbursts the light curve of Aql X-1 is dominated by the ``reflection effect,'' that is, by heating of the side of the companion star facing the neutron star. .

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