389 citations · 4.3k across the 97 of their papers we have counts for
100 papers
The star catalogue of Wilhelm IV, Landgraf von Hessen-Kassel: Accuracy of the catalogue and of the measurements
Frank Verbunt, Andreas Schrimpf
We analyse a manuscript star catalogue by Wilhem IV, Landgraf von Hessen-Kassel, from 1586. From measurements of altitudes and of angles between stars, given in the catalogue, we f…
The star catalogue of Wilhelm IV, Landgraf von Hessen-Kassel
Andreas Schrimpf, Frank Verbunt
Near the end of the 16th century Wilhelm IV, Landgraf von Hessen-Kassel, set up an observatory with the main goal to increase the accuracy of stellar positions primarily for use in…
Why Halley did not discover proper motion and why Cassini did
Frank Verbunt, Marc van der Sluys
In 1717 Halley compared contemporaneous measurements of the latitudes of four stars with earlier measurements by ancient Greek astronomers and by Brahe, and from the differences co…
A new look at distances and velocities of neutron stars
Frank Verbunt, Eric Cator
We take a fresh look at the determination of distances and velocities of neutron stars. The conversion of a parallax measurement into a distance, or distance probability distributi…
The observed velocity distribution of young pulsars
Frank Verbunt, Andrei Igoshev, Eric Cator
We argue that comparison with observations of theoretical models for the velocity distribution of pulsars must be done directly with the observed quantities, i.e. parallax and the…
The mass of the black hole in 1A 0620-00, revisiting the ellipsoidal light curve modeling
Theo F. J. van Grunsven, Peter G. Jonker, Frank Verbunt +1
The mass distribution of stellar mass black holes can provide important clues to supernova modeling, but observationally it is still ill constrained. Therefore it is of importance…