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

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ouas.rept.....s&link_type=abstract

Technical Report, OUAST/97/12 Dept. of Astrophysics

Astronomy and Astrophysics

Astrophysics

Companion Stars, Neutron Stars, Stellar Rotation, H Alpha Line, X Ray Sources, Spectral Resolution, Accretion Disks, Emission Spectra, Radial Velocity, Stellar Spectra

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) km/s. By measuring the width of the H-alpha emission line profile of the accretion disc, we estimate the binary inclination to approx. 50 deg and also estimate the semi-amplitude of the companion star's radial velocity curve to be approx. 170 km/s.

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