The H-R Diagram                             Name ____________________________

            Prof. Jon Satko

Refer to the Hertzsprung-Russell (HR) diagram in your book (p. 505).

1. For the red star Proxima Centauri (lower right corner) give the following information:

(Be sure to include units when appropriate!)

Spectral Type ____________        Approx. surface temperature ___________________

Approx. luminosity _____________________

(You may check most of these answers with Appendix F (Stellar Data) in your book, which gives the correct information.)

2.       What is the name of the G-type star with luminosity of roughly 1000 solar units?

3. Name a main-sequence star that has roughly the same temperature as the orange giant Pollux.

4. Name a main-sequence star that has roughly the same luminosity as Pollux.

5.       Name a main-sequence star with roughly the same radius as Pollux.

6. If two stars have the same luminosity, do they necessarily have the same temperature?

7. Give the name of a star that fits the following description:

a)      very dim and very hot             ___________________________

b)      very dim and cool                    ___________________________

c)      very bright and very hot                      ___________________________

d)      very bright and cool                 ___________________________