1. STARS!
Objective
Warm-Up
Students will use the Wavelength and Frequency to describe the Electromagnetic Spectrum.
What does ROY G. BIV stand for? What part of the electromagnetic spectrum does it come from?

2. The Electromagnetic Spectrum
BE Prepared to put the wavelengths in order once the clip is over!

3. Electromagnetic Spectrum
Stars produce energy in the form of ELECTROMAGNETIC WAVES!

4. Electromagnetic Spectrum
All types of electromagnetic waves form the ELECTROMAGNETIC SPECTRUM

5. The Electromagnetic Spectrum
What do you notice about the wavelength?

6. Electromagnetic Spectrum
Cell Phone and Pop Corn What type of radiation is it?

7. Electromagnetic Spectrum
Longest Wavelength
Shortest Wavelength

8. ROY G BIV: red, orange, yellow, green, blue, indigo, violet
VISIBLE LIGHT
Is only a small part of the spectrum
ROY G BIV: red, orange, yellow, green, blue, indigo, violet

9. All colors together = White Light

10. Closure:
What happens to white light as it passes through a prism? Brain-Pop matching and paragraph

11. Characteristics of Stars
Objective
Warm-Up
Students will use the characteristics of stars (know) in order to explain how stars are classified(do).
1. What happens to white light as it passes through a prism? 2. Thinking back to last class, Red stars would be _____(hotter/cooler) than blue stars and have a (longer/shorter) wavelength indicating a (higher or lower) frequency.

12. Distance of Stars
PARALLAX: Apparent change in position of a star caused by a change in position of the observer on Earth; Closer stars appear to shift, farther stars don’t (finger trick)

13. Light Year Distance light travels in one year.
speed=310,000 km/sec
(~7X’s around the earth);
1 light year = ~9.5 trillion km
Lets see how fast light travels compared to other things….

14. To Infinity & Beyond… How long would it take????
Journey
By Car
By Apollo
Light speed
Leave the atmosphere
11 hours
17 minutes X
Earth to moon
5 months
4 days
1 minute
To Mars (at closest)
63 years
2 yrs
3 minutes
To Sun
171 years
4 yrs
8 minutes
To Closest
4920 years
123 yrs
4 hours
Proxima Centauri (closest Star)
46,000,000 years
1,000,000 years
4 years
Center of Galaxy
300,000,000,000 years
8,000,000,000 years
30,000 years
To Andromeda Galaxy
Don’t think about it
2,000,000 years

15. Proxima Centauri
Closest star to our Sun. 4.2 light years away!

16. Color & Temperature Spectral Class: Oh, Be, A, Fine, Guy, Kiss, Me
O= Ultra Violet, B=Blue, A=White, F=Yellow- White, G=Yellow (sun), K=Orange, M= Red 

17. Color determines Temperature! O=Hottest & M=Coolest
Color & Temperature
Color determines Temperature! O=Hottest & M=Coolest

18. Magnitude Brighter star / lower number
Brightest stars have a negative number

19. Missing Work by WEDNESDAY! SCIENCE BUCKS FRIDAY
Closure
Star characteristics Worksheet
Hand-in:
24.1 & Closure
Dictionary
Missing Work by WEDNESDAY!
SCIENCE BUCKS FRIDAY

20. Star Classification…
Objective:
Warm-Up:
Students will use the characteristics of stars(know) in order to explain how stars are classified on the H-R Diagram(do).
What information do scientist use to classify stars? (Think about the factors that effect magnitude)

21. Hertsprung- Russell Diagram
Position determined by Temperature

22. Hertsprung- Russell Diagram
Most stars are Main Sequence Star, including our Sun!

23. H-R Diagram:
Plots the life cycle of a star along with color and brightness.
Shows the relationship between temperature and brightness

24. Closure:
What property is along the x-axis of the H-R diagram? What property is along the Y axis of the H-R diagram? Describe the luminosity of a Blue O class star and the temperature.

25. Closure: True/False
The location of a star on the H-R diagram gives us an indication of the size of the star.
A red giant and a red dwarf are in the same luminosity class.
In the spectral sequence of stars, F stars are the hottest stars.
Low luminosity stars are more common than high luminosity stars.
High mass stars are more common than low mass stars.
The most massive main sequence stars are the M stars.
When we see an eclipsing binary system, we know that the orbit is inclined nearly or exactly edge-on.
The main sequence stars obey a mass luminosity relation. The more luminous stars are less massive

26. RAM Hour In your seat, you need your Binder. Make up work
Dictionary DUE TODAY!!!!
VOCAB WORKSHEET

27. H-R Diagram
Objective
Warm-Up
Students will use the characteristics of stars in order to explain how stars are classified on the H-R Diagram.
What characteristics are used to classify stars on the H-R diagram? What relationship is does the diagram show?

28. Closure: (10 points)
Explain in at least 5 sentences how stars are classified on the H-R digram and where you can find the coolest star, the brightest star and our sun. Describe the relationship between wavelength and frequency. 3 sentences