NATS 1740 Lecture Notes - Lecture 12: Solar Wind, Protostar, Main Sequence

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NATS 1740 Full Course Notes
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NATS 1740 Full Course Notes
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Lecture 12 - the life of stars: seven ages for our sun, the life of a very large star, neutron stars (pulsars, close binary systems. What is a typical star speed : how many star nurseries are in our galaxy , explain the planetesimals model, describe research on other planetary systems. The 1st age: 1st age corresponds to the gravitational collapse which leads to the formation of the protostar, the energy generated by the collapse is pumped out making the young sun about 500 times more luminous than today. 50 times larger than today and its rotation was much faster than today: after about 8 million years of gravitational collapse the sun becomes of about the same size as today. To ignite them the sun used the gravitational energy produced by the collapse: today we are after 4. 5 billion years of the 2nd age and every second the sun. Burns about 600 millions of tons of hydrogen.

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