TODAY’S VOCABULARY STAR MAGNITUDE: A term used to describe the brightness of a star.

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Presentation transcript:

TODAY’S VOCABULARY STAR MAGNITUDE: A term used to describe the brightness of a star.

NOTE: THE BIGGER THE NUMBER, THE DIMMER THE STAR

ASTRONOMY UNIT INVESTIGATING THE HR DIAGRAM

STAR CHARACTERISTICS

STAR COLOR Shows the SURFACE TEMPERATURE of the star RED = COOLER BLUE = HOTTER

Each temperature range was given its own SPECTRAL CLASS

Other Characteristics STAR BRIGHTNESS Depends on three things: Size of the star Temperature of the star How far away STAR BRIGHTNESS Depends on three things: Size of the star Temperature of the star How far away

Star Luminosity Defined as how much energy a star is giving off

The Hertzsprung-Russell Diagram 1910 Two scientists: Ejnar Hertzsprung and Henry Norris Russel 1910 Two scientists: Ejnar Hertzsprung and Henry Norris Russel

AXES LUMINOSITY (brightness) VS SURFACE TEMPERATURES Discovered a pattern….

Main Sequence Stars Stars that are fusing H + H = He +energy Stars that are fusing H + H = He +energy SIRIUS A OUR SUN

White Dwarfs Stars that are very hot (25,000K) and very small (size of the earth) Ring-Like Planetary Nebula SuWt 2

Giants and Supergiants Huge stars (100 – 1000 times the size of our sun) Relatively cool ( 3,000K = red cool) Some are called RED GIANTS Extremely hot (30,000K = blue color) Huge stars (100 – 1000 times the size of our sun) Relatively cool ( 3,000K = red cool) Some are called RED GIANTS Extremely hot (30,000K = blue color)

UY Scuti

Betelguese

ANTERES A

What does this pattern mean? The stars in the universe are at different stages in their life cycles. Some stars are young and hot Others are older and colder. v=ZXpuDXOHeLo

Video clip…. P30HrM P30HrM WX1NA WX1NA P30HrM P30HrM WX1NA WX1NA

Review so far…. 3LpWg 3LpWg yH3eI yH3eI 3LpWg 3LpWg yH3eI yH3eI

TODAY’S ACTIVITY HR DIAGRAM WS Due end of the hour HR DIAGRAM WS Due end of the hour

TICKET OUT THE DOOR In general, hotter temperature star will look brighter than lower temperature stars. Our sun is average temperature – about 6000K. This is much, much cooler than the blue supergiants – about 30,000K So….. Why does the sun look so bright? In general, hotter temperature star will look brighter than lower temperature stars. Our sun is average temperature – about 6000K. This is much, much cooler than the blue supergiants – about 30,000K So….. Why does the sun look so bright?

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