1. Learning Goals:
4. Complex Knowledge: demonstrations of learning that go aboveand above and beyond what was explicitly taught. 3. Knowledge: meeting the learning goals and expectations. 2. Foundational knowledge: simpler procedures, isolated details, vocabulary. 1. Limited knowledge: know very little details but working toward a higher level.
How do stars differ from moons and planets, and from one another?
How does the classification of stars help us understand how they evolve over their lifetimes?
What are the different types of stars?
What happens when different types of stars die?
Why is it important for us to understand stars?

2. Learning Goals:
4. Complex Knowledge: demonstrations of learning that go aboveand above and beyond what was explicitly taught. 3. Knowledge: meeting the learning goals and expectations. 2. Foundational knowledge: simpler procedures, isolated details, vocabulary. 1. Limited knowledge: know very little details but working toward a higher level.
How do stars differ from moons and planets, and from one another?
How does the classification of stars help us understand how they evolve over their lifetimes?
What are the different types of stars?
What happens when different types of stars die?
Why is it important for us to understand stars?

3. If you have to take a test….
Tomorrow (short day) is the best day to come take it.

4. Main Star Characteristics
Size
Mass
Radius
Color
Temperature
Spectral class
Lifetime

5. Of the stars in this image, which do you think are:
Hottest?
Coldest?
Biggest in diameter?
Smallest in diameter?
Brightest?
Least bright?
What information did you use to determine these properties of the stars?
Do you have enough information to determine all of these properties? If not, what other information would you need?

6. Temperature and color Wein’s law!
Objects at different temperatures emit spectra that peak at different wavelengths
Max = c/T(K)
Sketch a visual representation of the following idea
Hotter objects emit radiation at shorter wavelengths (high energy) so they will appear bluer
Cooler objects emit most of their radiation at longer wavelengths (low energy), so they appear redder.

7. Stellar characteristics
Spectral class
Radius
(sun=1)
Mass
Temp.
Color
Lifespan
Examples
Abundance O B A F G K M

8. Spectral class
Temperature
(kelvin)
Color O
+31,000
Blue B
10,000-31,000
Blue-White A
7,400-10,000
White F
6,000-7,400
Yellow-white G
5,300-6,000
Yellow K
3,900-5,300
Orange M
2,200-3,900
Red

9. Size of Stars http://apod.nasa.gov/apod/ap110222.html4Q

10. Look at your card
Make a picture postcard of your star. Your postcard should:
Point out the important and exciting features of the star
Include a sketch or picture of the star
highlight characteristics such as:
color
surface temperature
mass
diameter
special features
A - Red dwarf 2 - White dwarf 3 - Brown dwarf 4 - Yellow Dwarf 5 - White main-sequence star 6 - Red giant 7 - Pulsar 8 - Binary Star 9 - Blue supergiant 10 - Protostar J - Cepheid variable star Q - Neutron star K – Your Choice of the above