PHY - Life cycle of stars

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8 Terms

1
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What are the parameters to describe stars?

  • Mass

  • Luminosity

  • Color (temperature)

  • Composition

  • Radius

  • Metallisity

2
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How are stars formed?

Nebula collapsing

3
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Why protostars have a disk?

Legacy of the small rotation of the nebula. The more it collapse the faster it goes.

4
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What are dark clouds.

Dense clouds before a protostar

5
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What are evidence of star formation?

  • Dark clouds

  • Disk around protostar

  • Observation of star-forming regions

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What is the Herztprung-Russel Diagram

Description of main sequence stars, plotting luminosity vs temperature of stars

7
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Main sequence of a start

  • Longest part

  • Achieve hydrogen burning which is fusion

  • Achieve hydrostatic equilibrium

8
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Explain the fate of a star

  • Lower mass becomes a red giant (H burning to He burning)

  • Higher mass explodes in supernova