A Java-applet has been developed to display tracks of evolution
of stars as they are given in a Hertzsprung-Russell Diagram
(HRD). This form of display is especially useful for beginners
in astronomy. The Java applet allows to highlight various parts
of the evolution and special regions in the HRD. Several more
features are available. The applet has been developed at the
Argelander-Institut für Astronomie of the University of Bonn.
Full german documentation "The javaHRD" by C. Carazo is
available (diploma thesis; 2006, Univ. Bonn). Click the image to
start the javaHRD-Applet.