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?

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

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

Electromagnetic Spectrum All types of electromagnetic waves form the ELECTROMAGNETIC SPECTRUM

The Electromagnetic Spectrum What do you notice about the wavelength?

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

Electromagnetic Spectrum Longest Wavelength Shortest Wavelength

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

All colors together = White Light

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

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.

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)

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….

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 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 2,000,000 years

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

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 

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

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

Missing Work by WEDNESDAY! SCIENCE BUCKS FRIDAY Closure Star characteristics Worksheet Hand-in: 24.1 & 25.1 Closure Dictionary Missing Work by WEDNESDAY! SCIENCE BUCKS FRIDAY

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)

Hertsprung- Russell Diagram Position determined by Temperature

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

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

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.

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

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

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?

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