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Life Cycle of a star

Life Cycle of a star. HR Diagram Review. The HR (Hertzsprung-Russel) Diagram. What patterns can be seen?. N. Main Sequence: Most stars fall in this diagonal area Giants: Have bright stars at the right Supergiants: Have the brightest stars in the top center White Dwarfs:

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Life Cycle of a star

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  1. Life Cycle of a star HR Diagram Review

  2. The HR (Hertzsprung-Russel) Diagram

  3. What patterns can be seen? N • Main Sequence: Most stars fall in this diagonal area • Giants: Have bright stars at the right • Supergiants: Have the brightest stars in the top center • White Dwarfs: Hot stars, but not very bright at the bottom left or bottom center

  4. Birth of a Star N • Stars begin their lives as parts of NEBULAS (gas clouds) which are large clouds of gas and dust spread out. • Gravity then acts on the nebulas pulling them closer, increasing the pressure until they start burning. • This is called a PROSTAR.

  5. Death of a Star N • Most stars burn H2 gas and are on the Main Sequence. • When a star runs out of fuel (H2), it starts to “die”. • Depending on its mass, it may either become a giant or a supergiant which burn Helium gas.

  6. Low or Medium mass stars(1.5 -3 times the Sun’s mass) N • Low or medium mass stars become red giants. • Dying stars expand and form planetary nebulae. • The remaining blue-white core is called a “White dwarf” • When the star is dead it stops glowing and becomes a black dwarf. • http://phschool.com/atschool/phsciexp/active_art/stellar_evolution/index.html

  7. High mass stars (More than 3 times the Sun’s mass) • When the fuel of high mass stars run out, they quickly evolve into brilliant supergiants. • Supergiants can collapse on themselves and explode as a SUPERNOVA. • After the Supernova, gravity packs the remaining mass into a smaller space. • The gravity is so strong that even light cannot escape. This is called the Black Hole. http://phschool.com/atschool/phsciexp/active_art/stellar_evolution/index.html http://www.space.com/10411-supernova-destroyer-creator.html N

  8. Now • http://sunshine.chpc.utah.edu/labs/star_life/hr_interactive.html • Draw the diagram to show the life cycle of a star

  9. The HR (Hertzsprung-Russel) Diagram

  10. H-R diagram questions • Where are most stars located on the HR diagram? • What color are the hottest stars on the HR diagram? • Where are the hottest stars located on the HR diagram? • Name a few hot stars. • What color are the coolest stars on the HR diagram? • Where are the coolest stars located on the HR diagram? • Name a few cool stars. • What are the 4 types of stars? • Where are the brightest stars located? • Name some of the brightest stars?

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