Disponible en Español.

A Hertzsprung-Russell (H-R) diagram is a graph, in logarithmical scale, of  Temperature vs Luminosity for stars. This program makes a H-R diagram with several stars and shows some properties. It is possible to add new stars to diagram, too.

Instructions:

• If you do a mouse click on a point of the diagram, it will appear a frame with information about the star.
  
• The Compare button is used to compare two stars. Press and then do a mouse click in two stars.
  
• If you want to add a new star, you must fill the three white box with the temperature, luminosity and name; then, you press Add and a nes star will appear in the diagram.