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Stellar Birth
Jade J
Rachael H
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Stages of Stars
• In the birth of a star there are seven stages in it’s formation.
• A star's life is a constant battle against gravity, and pressure support. That battle begins as soon as a molecular cloud begins to collapse into a protostar.
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Interstellar Clouds
• Name given to an accumulation of gas, plasma and dust.
• Denser than the average region of interstellar medium.
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Collapsing Cloud Fragment
• At this phase the cloud is very diffuse, so heat is not trapped so the temperature does not build up.
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Fragmenting Ceases
• Several tens of thousands of years after the collapse of the cloud the center becomes opaque and the temperature rises greatly.
• The cloud typically begins to shrink in size and the appearance of a potostar can be seen at the center.
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Protostar
• At this stage the cloud begins to collapse on its self increasing the temperature and causing it to contract.
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Protostar Evolution
• As the protostar moves past stage four it moves closer to the main sequence.
• This stage is characterized by violent surface activity and strong protostellar winds.
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Newborn Star
• The temperature has now become high enough for thermonecular fusion to begin
• This results in somewhat lower luminosity
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Main Sequence
• The star contracts a bit more and enters into hydrostatic equilibrium.
• During the main sequence lifetime, the star achieves stability by gas pressure.