NATS 1745- Final Exam Guide - Comprehensive Notes for the exam ( 143 pages long!)
30 Nov 2017
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What is a star: they are objects in the universe which generate their own energy, stars are hot but even hotter on the inside then the outside. Parsec: the parsec is a unit of distance defined as the distance a star will be if it has a parallax of 1"" (arcsecord) = 3. 35 light years. Inverse square law: the intensity of light decreases with the inverse-square of the distance, just know that with distance the light gets diluted over a larger area, so the star looks fainter. Stellar spectroscopy: stars were classified according to their absorption line patter (their spectra, different absorption had different pattern, late 1800"s: 3 possible classes of stars, 1. G: k, m few absorption lines, many atoms have electrons totally removed, no absorption lines can be produced, mass: most massive 20-100mo, uv: most emission on uv.
