1.3k citations · 23.8k across the 148 of their papers we have counts for
9 papers · 1 filter
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…
Galaxy mapping with the SAURON integral-field spectrograph: The star formation history of NGC 4365
Roger L. Davies, Harald Kuntschner, Eric Emsellem +9
We report the first wide-field mapping of the kinematics and stellar populations in the E3 galaxy NGC 4365. The velocity maps extend previous long-slit work. They show two independ…
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…
HST Optical-NIR Colors of Nearby and Exponential Bulges
C. M. Carollo, M. Stiavelli, P. T. de Zeeuw +2
We have analysed , and HST images for a sample of early- to late-type spiral galaxies, and reported elsewhere the statistical frequency of -law and exponential…
Triaxial Haloes and Particle Dark Matter Detection
N. W. Evans, C. M. Carollo, P. T. de Zeeuw
This paper presents the properties of a family of scale-free triaxial haloes. We adduce arguments to suggest that the velocity ellipsoids of such models are aligned in conical coor…
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…
Mapping the substructure in the Galactic halo with the next generation of astrometric satellites
Amina Helmi, P. Tim de Zeeuw
We run numerical simulations of the disruption of satellite galaxies in a Galactic potential to build up the entire stellar halo, in order to investigate what the next generation o…
The black hole in IC 1459 from HST observations of the ionized gas disk
G. A. Verdoes Kleijn, R. P. van der Marel, C. M. Carollo +1
The peculiar elliptical galaxy IC 1459 (M_V = -21.19, D = 16.5 Mpc) has a fast counterrotating stellar core, stellar shells and ripples, a blue nuclear point source and strong radi…