Name: ________________________ GIVEN 11/05 ID number: ________________________

Quiz 11. What Are These Stars?

Shown on the screen is an HR diagram. In addition to the grey band which represents the main sequence, four stars have been plotted and labeled by the letters a, b, c, & d.

1. Classify each star in terms of the four general kinds listed below.

main sequence ________
white dwarf ________
red giant ________
supergiant ________

2. Briefly describe the nuclear reactions (if any) going on in each of these stars.

3. Finally, are any of these stars likely to become a supernova?

Joshua E. Barnes (
Last modified: November 4, 1999