NATS 1745 Lecture Notes - Lecture 9: Spectroscopy, Roygbiv, Prims
15 Feb 2016
School
Department
Course
Professor
Document Summary
Light from stars, nebulae, planets sent through prism spectrum seen: birth of astrophysics: key tool in understanding physical nature, stars, nebulae, etc, photography: Allowed more accurate recordings of sky- a. positions; b. brightness/ magnitude. Allowed for long exposures could pick faint emission (esp. nebulae: distances: more precise observations via technology could accurately measure distances to closest stars. Start understanding vast scale of galaxies: spectroscopy. 1665 newton"s experiments with prisms coined term spectrum : 7 colors: roygbiv. 1704 published optiks: colors are fundamental property of all light, white light is combinations of all colors in spectrum. 1802 wollaston: observed solar spectrum through prims, noticed dark lines, thought they were dividing between colors. So, they all have the same spectrum as sun. However, if u look at a different place u may see different patterns: noticed: other spectrums were all different from each other (different patterns of dark lines) each stars spectrum was unique.
