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Astron. Astrophys. 331, 949-958 (1998)

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5. Conclusion

Hipparcos has provided a large, systematic data base of high precision proper motions that yield internal precisions of tangential velocities that are comparable to the current uncertainties of radial velocities of Galactic OB and WR stars at distances of several kpc. However, unlike Doppler RVs, the pm's are not biased by line blending and contamination by winds, and are thus probably more robust. This has allowed us for the first time to make a reliable systematic study of the motions of Galactic WR stars and compare them with O stars. The next era of astrometric satellites (e.g. ESA's GAIA: pm's to [FORMULA] 0.01 mas/yr down to V = 15 mag) promises to be revolutionary.

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© European Southern Observatory (ESO) 1998

Online publication: March 3, 1998
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