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Chapter 16

Astronomy Chapter 16 Notes.pdf

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Western University
Astronomy 1021
Trevor Kirsh

Chapter 16: Star birth •They are lumpy clouds of high density How a star’s life begins regions •Sold grains called interstellar dust prevent visible light from passing through these clouds but we can use • Star birth occurs when gravity squeezes a cloud of gas into the point infrared observations to see whats that it forms a star with a core hot going on inside them enough to sustain nuclear fusion •Stars seen near the edges of a Keep in mind theres a ever present molecular cloud appears redder and • this phenomenon is known as battle between the inward pull of interstellar reddening and it happens gravity and the outward push of because the dust grains have longer pressure • Stars form in molecular clouds because wavelengths which appears red these clouds have the relatively high because blue light are blocked densities and low temperatures needed Why do stars form to give gravity the upper hand in its •A star can form in a molecular cloud battle against pressure only when gravity is strong enough to • A single molecular cloud typically overpower the outward push of thermal fragments into many pieces as it contracts, leaving behind a star cluster pressure with many more low mass stars than •Thermal pressure is the temperature high mass stars dependent pressure of ordinary gas •A pressure build up may be prevented • Stars are born with a wide range of from gravitational contraction masses, but lower mass stars are born •This is when gravity makes a gas cloud in more numbers than higher mass stars shrink, and converts some of its • The process of star formation also gravitational potential energy into gives birth to many objects like brown thermal energy, which gets released dwarfs that are too small to shine with which stops star formation •So gravity causes a molecular cloud to energy generated by nuclear fusion contract and it continues until the center is hit enough for nuclear fusion 16.1 •Stars tend to form in clusters because gravity can more easily overcome Where do stars form pressure in more massive molecular clouds • Although spaces between stars is a •A large cloud fragments into many vacuum and its empty there are still smaller clumps of gas as it contracts some gas and dusts and we call them because the advantage of gravity over interstellar medium • These gas have the same chemical pressure increases as a clump of gas composition but they have very shrinks in size different temperature and density and •There are no more first generation stars in the universe anymore because they so they can look really different all died • Stars form in cold, relatively dense •First generation stars were really big molecular clouds and hence they die fast jets
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