PHYS 1901 Lecture Notes - Lecture 23: Chromosphere, Convection Zone, Photosphere

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1 lecture 11: the sun an introduction to. Stars: read chapter 16 in the textbook, exercises: do all review and discussion and all conceptual self-test . 1 au away (1. 5 108 km) Mass 1. 99 1030 kg (332, 000 earth masses) Radius 696, 000 km (109 earth radius) Luminosity 3. 84 1026 w: solar interior: Di cult to get complete picture we only see the photosphere. The sum maintains itself from gravitational collapse through hydrostatic equilib- rium. The pressure inside the sun can cause vibrations helioseismology. Pressure wave can be detected by doppler shifts in the photosphere many on- going projects (soho etc. ) Central core about 20 times denser than iron temperature 1. 5 107 k. Photons do not free-stream in the core they scatter o free electron ans protons. Takes over a million years for a photon to wander out of the sun!

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