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STARS Mrs. Anton
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Similarity - human and stars life cycle
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Star Facts Our sun – nearest star Gases, gives of heat and light
Billions of stars Look like points because far away Stars different colors Rigel – blue Betelgeuse – red Our sun - yellow
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Birth of a Star Most stars – hydrogen and helium Steps towards birth
1. Nebula - spinning gas and dust 2. Gravity causes it to shrink until a disk 3. Protostar - center of disk, becomes star 4. Shrinks and heat increases 5. When temp. high enough – gives off light and becomes a star when hydrogen changes to helium
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After Birth Lets Review: Protostar becomes a real star when it is hot enough for hydrogen to change to helium and give off light THEN Enter 2nd stage – Main Sequence Star Leaves this stage when all fuel (gas) is used up Shrinks AND temperature increases Helium changes to carbon
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Look at this while studying the next slide
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Protostar-Massive Star
Nebula Protostar-Massive Star Main Sequence Red Supergiant Supernova Neutron Star Black Hole Medium Size Star Nebula Protostar -Average star Main Sequence Red Giant Planetary Nebula White Dwarf
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Magnitude Magnitude – measure of star brightness
Apparent Magnitude – Brightness as seen from earth Absolute Magnitude – Actual brightness as if all the stars are the same distance away
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Shows relationship between absolute magnitude and temperature
Shows relationship between absolute magnitude and temperature .Remember color changes when temperature changes. A star’s place on diagram depends on temperature and absolute magnitude. Most stars fall in a band that runs from the upper left to the lower right of the diagram – called the main sequence stars H-R Diagram
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Practice reading the HR Diagram on your worksheet 18-4 “How are Stars Classified?”
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