Post on 29-Dec-2015
Objective Warm-Up
What does ROY G. BIV stand for?
What part of the electromagnetic spectrum does it come from?
Students will use the Wavelength and Frequency to describe the Electromagnetic Spectrum.
STARS!
The Electromagnetic Spectrum
BE Prepared to put the wavelengths in order once the
clip is over!
Cell Phone and Pop Corn
What type of radiation is it?
Electromagnetic Spectrum
•Is only a small part of the spectrum•ROY G BIV: red, orange, yellow, green, blue, indigo, violet
VISIBLE LIGHT
All colors together = White Light
Light
Objective Warm-Up
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.
Students will use the characteristics of stars (know) in order to explain how stars are classified(do).
Characteristics 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)
Distance of Stars
Distance light travels in one year. speed=310,000 km/sec
(~7X’s around the earth);
1 light year = ~9.5 trillion km
Light YearLets see how fast light travels compared to other things….
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 Neptune @ 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
Don’t think about it
2,000,000 years
To Infinity & Beyond… How long would it take????
•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
Color & Temperature
Star characteristics Worksheet
Hand-in:
24.1 & 25.1 Closure
Dictionary
Missing Work by WEDNESDAY!
SCIENCE BUCKS FRIDAY
Closure
Objective:
Warm-Up:
What information do scientist use to classify stars? (Think about the factors that effect magnitude)
Students will use the characteristics of stars(know) in order to explain how stars are classified on the H-R Diagram(do).
Star Classification…
H-R Diagram:
Shows the relationship between temperature and brightness
Plots the life cycle of a star along with color and brightness.
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.
Closure:
1. The location of a star on the H-R diagram gives us an indication of the size of the star.
2. A red giant and a red dwarf are in the same luminosity class.
3. In the spectral sequence of stars, F stars are the hottest stars.
4. Low luminosity stars are more common than high luminosity stars.
5. High mass stars are more common than low mass stars.
6. The most massive main sequence stars are the M stars.
7. When we see an eclipsing binary system, we know that the orbit is inclined nearly or exactly edge-on.
8. The main sequence stars obey a mass luminosity relation. The more luminous stars are less massive
Closure: True/False
• In your seat, you need your Binder.
• Make up work
• Dictionary DUE TODAY!!!!
• VOCAB WORKSHEET
RAM Hour
Objective Warm-Up
What characteristics are used to classify stars on the H-R diagram?
What relationship is does the diagram show?
Students will use the characteristics of stars in order to explain how stars are classified on the H-R Diagram.
H-R Diagram