ASTRON 101 Lecture Notes - Lecture 6: Convection Zone, Radiation Zone, Heat Transfer
14 Aug 2018
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Document Summary
Conditions for thermonuclear fusion that generates energy. Temperature at the sun"s center is much larger than sun"s surface. Gravity, strong and weak nuclear forces, electromagnetic force are important in any star"s interior. Pressure support throughout the interior of a star. Electromagnetic force is important at a star"s surface. Humans worldwide use about 4 x 10^ 20 joules of energy per year. Luminosity is the rate at which energy is radiated from a surface. Brightness is how much energy is coming from a light source (star per square. Temperature and radius are intrinsic properties of the star. Flux is what you measure of a source at a distance, d. Luminosity is intrinsic energy rate of the star/object meter per sec. Nuclear fusion: nuclei combine (fuse) to make larger nuclei. Difference in input masses is converted into energy: e=mc . Neutrinos are produced when protons turn into neutrons (or vice versa)
