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Astron. Astrophys. 350, 1085-1088 (1999)

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4. Conclusions

Using the criterion that no parallax has been detected if its derived value is less than twice its statistical uncertainty, we find that the Hipparcos parallaxes of the four massive X-ray binaries and three Be/X-ray binaries in our sample are consistent with their previously accepted spectroscopic-parallax distances. The Hipparcos proper motions of the binaries with OB supergiants correspond to peculiar tangential velocities at their spectroscopic-parallax distances which are in agreement with the predictions of the Blaauw mechanism. The results provide no support for the existence of a visible component in any of these systems with a stellar structure not normal for its spectral type.

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© European Southern Observatory (ESO) 1999

Online publication: October 14, 1999
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