• Write down short answers to the questions posed at the beginning of the lectures

• Write down answers to the Concept and Quiz questions

Study Suggestions

Fig. 6.12

There are two kinds of spectra: continuous and line.Blackbodies have continuous spectra, characteristic of only their temperatures.

Fig. 6.131 nm = 10-9 m, 1 Angstrom = 10-10 m

Red

Blue

Yellow

Blackbodies

Fig. 6.14

Understand this figure!Spectral Formation

Temperatures•Core 15x106 K•Photosphere 5800 K•Corona 106 K

Densities•Surface <0.01 g cm-3

•Core >100 g cm-3

•Mean 1.4 g cm-3

The Structure of the Sun

Fig. 16.10

The Hertzprung-Russell Diagram

Fig. 19.02

How does the heavy element abundance change with time?

The Star-Gas-Star Cycle

•Total mass 7x1011 Msolar•Stellar mass 2x1011 Msolar•Gas mass 5x1010 Msolar•>12 billion years old

Fig. 19.01a

Fig. 19.01b

The Milky Way’s Structure

Fig. 23-02

Eras of the

Universe