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Title of Journal: Astrophys Space Sci

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Abbravation: Astrophysics and Space Science

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Kluwer Academic Publishers

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DOI

10.1006/viro.2001.1161

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1572-946X

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On the Binary Nature of SS 433

Authors: Linda Schmidtobreick Katherine Blundell
Publish Date: 2006/08/05
Volume: 304, Issue: 1-4, Pages: 271-274
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Abstract

We present time–resolved optical spectroscopy of the famous Xray binary SS 433 We obtained 61 medium resolution spectra spread over three months and thus cover roughly five orbits and about half a precession phase We used various emission lines that we attribute to the accretion disc to determine the radial velocities of the compact component They are of course modulated with the orbital period but in addition show a variation of the system velocity on a longer time scale With the present data it is not possible to determine whether this is a transient effect or a periodic variation although we present various possible interpretations of this effect

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