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A Hipparcos study of the Hyades open cluster: Improved colour-absolute magnitude and Hertzsprung-Russell diagrams
Jos H. J. de Bruijne, Ronnie Hoogerwerf, P. Tim de Zeeuw
Hipparcos parallaxes fix distances to individual stars in the Hyades cluster with an accuracy of 6%. We use the Hipparcos (and Tycho-2) proper motions, which have a larger relative…
Two Boehm-Vitense gaps in the main sequence of the Hyades
Jos H. J. de Bruijne, Ronnie Hoogerwerf, P. Tim de Zeeuw
Hipparcos proper motions and trigonometric parallaxes allow the derivation of secular parallaxes which fix the distances to individual stars in the Hyades cluster to an accuracy of…
On the origin of the O and B-type stars with high velocities II Runaway stars and pulsars ejected from the nearby young stellar groups
R. Hoogerwerf, J. H. J. de Bruijne, P. T. de Zeeuw
We use milli-arcsecond accuracy astrometry (proper motions and parallaxes) from Hipparcos and from radio observations to retrace the orbits of 56 runaway stars and nine compact obj…
The origin of runaway stars
R. Hoogerwerf, J. H. J. de Bruijne, P. T. de Zeeuw
Milli-arcsecond astrometry provided by Hipparcos and by radio observations makes it possible to retrace the orbits of some of the nearest runaway stars and pulsars to determine the…