sun&starsrev

sun&starsrev - The Sun Definition of a Star - A...

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Unformatted text preview: The Sun Definition of a Star - A glowing ball of gas held together by its gravity and powered by nuclear fusion. Vital statistics: Radius: 696,000km (100 Earth Radii) Mass: 1.99*10^30 kg Average Density: 1410 kg/m^3 Rotation Period 24.9 days (equator); 29.8 days (poles) Surface temp. 5780K Luminosity: 3.86 10^26 W Chemical Composition: Element ......% of total number of atoms.......% of total mass Hydrogen................91.2............................ 71 Helium .....................8.7 ...........................27.1 Oxygen .................0.078 ............................0.97 Carbon .................0.043 .............................0.40 Etc. Overall Structure of the Sun. Core - 200,000 km Radiation Zone - 300,000 km Convection Zone - 200,000 km Photosphere - 500 km - what we see and call the 'surface' Chromosphere Corona Solar Wind The Solar Interior - Standard Solar Model We cant observe the solar interior directly. Mathematical models are developed to understand the interior. These models must fit observations and known laws of Physics. That is they must explain the surface temperature of the Sun etc using physics phenomena consistent with the conditions (like temperatures and pressures) predicted by the models. Additional information used to test these models if obtain from helioseismology (the study of vibrations on the Sun as a whole) Two key questions will be asked about the interior of the Sun (and any other star for that matter) they are: 1. Where is the energy produced (i.e. where is the fusion occurring AND what elements are involved in the 1....
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sun&starsrev - The Sun Definition of a Star - A...

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