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The rotation speed of the companion star in Aquila X-1

T. Shahbaz·J. Casares·P. A. Charles
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Abstract

We have obtained medium resolution spectra of the neutron star X-ray transient Aql X-1 during quiescence. We determine the spectral type of the companion star to be K1 and also estimate its rotation speed to be 62(+30 -20) kms-1. By measuring the width of the Halpha emission line profile of the accretion disc, we estimate the binary inclination to about 50 degrees and also estimate the semi-amplitude of the companion star's radial velocity curve to be about 170 kms-1.

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T. Shahbaz, J. Casares, P. A. Charles. 1997-07-30. The rotation speed of the companion star in Aquila X-1. https://arxiv.org/abs/astro-ph/9707331

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