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STJ Observations of the Eclipsing Polar HU Aqr
C. M. Bridge, Mark Cropper, Gavin Ramsay +6
We apply an eclipse mapping technique to observations of the eclipsing magnetic cataclysmic variable HU Aqr. The observations were made with the S-Cam2 Superconducting Tunnel Junct…
Direct determination of quasar redshifts
Jos de Bruijne, Alastair Reynolds, Michael Perryman +6
We present observations of 11 quasars, selected in the range z = 2.2-4.1, obtained with ESA's Superconducting Tunnel Junction (STJ) camera on the WHT. Using a single template quasa…
Analysis of astronomical data from optical superconducting tunnel junctions
Jos H. J. de Bruijne, Alastair P. Reynolds, Michael . A. C. Perryman +2
Currently operating optical superconducting tunnel junction (STJ) detectors, developed in ESA, can simultaneously measure the wavelength (delta lambda = 50 nm at 500 nm) and arriva…
The origin of the runaway high-mass X-ray binary HD153919/4U1700-37
A. Ankay, L. Kaper, J. H. J. de Bruijne +3
Based on its Hipparcos proper motion, we propose that the high-mass X-ray binary HD153919/4U1700-37 originates in the OB association Sco OB1. At a distance of 1.9 kpc the space vel…
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…
A refurbished convergent point method for finding moving groups in the Hipparcos Catalogue
Jos H. J. de Bruijne
The Hipparcos data allow a major step forward in the research of `moving groups' in the Solar neighbourhood, as the common motion of group members causes converging proper motions.…
A Hipparcos census of the nearby OB associations
P. T. de Zeeuw, R. Hoogerwerf, J. H. J. de Bruijne +2
A comprehensive census of the stellar content of the nearby OB associations is presented, based on Hipparcos positions, proper motions, and parallaxes. Moving groups are identified…
Scale-free dynamical models for galaxies: flattened densities in spherical potentials
Jos H. J. de Bruijne, Roeland P. van der Marel, P. Tim de Zeeuw
This paper presents two families of phase-space distribution functions (DFs) that generate scale-free spheroidal mass densities in scale-free spherical potentials. The `case I' DFs…