SIMBAD references

1997A&A...326L...5S - Astronomy and Astrophysics, volume 326, L5-8 (1997/10-1)

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

SHAHBAZ T., CASARES J. and CHARLES P.A.

Abstract (from CDS):

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+30–20km/s. By measuring the width of the Hα emission line profile of the accretion disc, we estimate the binary inclination to ∼50° and also estimate the semi-amplitude of the companion star's radial velocity curve to be ∼170km/s.

Abstract Copyright: ∼

Journal keyword(s): binaries: general - stars: fundamental parameters, stars: individual: Aql X-1 - stars: neutron

Simbad objects: 9

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