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

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dc.creatorShahbaz, T.
dc.creatorCasares, J.
dc.creatorCharles, P. A.
dc.date1997-07-30
dc.date.accessioned2026-07-07T02:23:55Z
dc.date.available2026-07-07T02:23:55Z
dc.descriptionWe 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.
dc.description4 pages Latex, 2 figures, to appear in Astron. Astrophys
dc.identifierhttps://arxiv.org/abs/astro-ph/9707331
dc.identifierhttp://arxiv.org/abs/astro-ph/9707331
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/11433
dc.subjectAstrophysics
dc.titleThe rotation speed of the companion star in Aquila X-1
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