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!

Stars produce energy in the form of ELECTROMAGNETIC

WAVES!

Electromagnetic Spectrum

All types of electromagnetic waves form the

ELECTROMAGNETIC SPECTRUM

Electromagnetic Spectrum

The Electromagnetic SpectrumWhat do you notice about the wavelength?

Cell Phone and Pop Corn

What type of radiation is it?

Electromagnetic Spectrum

Electromagnetic Spectrum

Longest Waveleng

th

Shortest Wavelengt

h

•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

What happens to white light as it passes through a prism?

Brain-Pop matching and paragraph

Closure:

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????

Closest star to our Sun.

4.2 light years away!

Proxima Centauri

•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

Color determines

Temperature!

O=Hottest &

M=Coolest

Color & Temperature

•Brighter star / lower number•Brightest stars have a negative number

Magnitude

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…

Hertsprung-Russell Diagram

Position determine

d by Temperatu

re

Hertsprung-Russell Diagram

Most stars are Main Sequence

Star, including our Sun!

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

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

Closure: (10 points)