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A Brief Introduction to Stellar Evolution

A Brief Introduction to Stellar Evolution. Teatime No.44 FAS, 2009. A star. What is a star?. Lifetime of a star. Molecular cloud Protostar Star End of a star. Molecular cloud. H 2 Gravity Collapse. Protostar. Duration: 10^5 a (1 solar mass) Cluster Heating End of protostar

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A Brief Introduction to Stellar Evolution

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  1. A Brief Introduction to Stellar Evolution Teatime No.44 FAS, 2009

  2. A star • What is a star?

  3. Lifetime of a star • Molecular cloud • Protostar • Star • End of a star

  4. Molecular cloud • H2 • Gravity • Collapse

  5. Protostar • Duration: 10^5 a (1 solar mass) • Cluster • Heating • End of protostar • Brown dwarf • star

  6. H-R diag

  7. Star • Main sequence • Fusion • PP Chain • CNO cycle • duration • Next…

  8. Fusion

  9. Next… • Low-mass (~0.4 M⊙) • May stay for trillions of a, longer then recent life of universe • End in a white dwarf • theoretically • Mid-sized • Massive

  10. Next… • Low-mass • Mid-sized (0.4 M⊙~2.25 M⊙ ~9 M⊙) • Helium fusion(3 α process) • Red Giant • Life: 10 billion a • Sun • Massive

  11. Next… • Low-mass • Mid-sized • Massive (9 M⊙~above) • Fusion ends at Fe-56 • Red Giant/ Red Super Giant • Supernova • Life time: ~ 1 million a • Neutron star/ Black hole

  12. End • White Dwarf • Neutron star • Black Hole

  13. acknowledgement • 大众天文学 C. 弗拉马里翁 • 香港大学物理系宇宙的本质讲义 • http://www.lcsd.gov.hk/CE/Museum/Space/EducationResource/Universe/framed_c/index.html • http://zh.wikipedia.org/内的相关条目

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