You can relate the colour of these stars to stellar evolution theory if you are covering it. This lavishly produced book looks at comets in history, comet art, scientifically exciting questions about comets, and their potential threat to the earth. You asked about which class is making the graphs. The light curve graphs are done by my physics students who are seniors in high school. It is actually very easy to do on computer graphics files.
Every image has a pixel count.
Take the MAP GAME link under the example column. When you click a picture it tells you the x and y values of where you clicked. I have software for graphing using the pixel count. The graph is reduced in color and saved as a gif file to reduce memory requirements. The data for graphing is obtained off the net.