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sci151r2week3content - Parallax and the Parsec...

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SCI 151 Astronomy Week Three Content Outline TOPICS AND OBJECTIVES The Sun and Stars Describe the nature and importance of light and other electromagnetic waves. Explain the nature of the Sun. Describe the properties of stars. Explain the life cycle of stars. CONTENT OUTLINE The nature of light Electromagnetic waves Gamma rays, x-rays, ultraviolet, visible, infrared, radio Wien’s law Travel at speed of light Astronomical instruments Types of telescopes What is important in purchasing a telescope? Atmospheric windows The nature of the Sun Observational Sun Solar constant Total energy Granules Sunspots Atomic structure Atomic nucleus and electron shells Examples of atoms Nuclear fusion Atomic structure Hydrogen fusion E=mc 2 Stellar structure Equilibrium-balance between gravity and radiation Stellar models The properties of stars Determining the distance to a star
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Unformatted text preview: Parallax and the Parsec Period-luminosity relation Star brightness and review distance factor Temperature and spectral class Spectral classification Page 1 of 2 SCI151r2 SCI 151 Astronomy O, B, A, F, G, K, M Other spectral information Composition Motion Magnetic fields Mass and diameter – as determined from binary stars H-R diagram Allows astronomers to sort stars into categories Location of main sequence, red giants, blue giants, white dwarves, red dwarves Introduction to stellar evolution Principles of evolution Gravitational energy (Helmholtz contraction) Core contraction or expansion to red giant Options depending on mass White dwarves Supernova Mass luminosity relation The more massive the star, the more luminous it is. The more luminous it is, the more rapidly it evolves. Page 2 of 2 SCI151r2...
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