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

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

1997-07-30

arxiv.org/abs/astro-ph/9707331v1

Astronomy and Astrophysics

Astrophysics

4 pages Latex, 2 figures, to appear in Astron. Astrophys

Scientific paper

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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