AST201H5 Chapter Notes - Chapter 12: Apparent Magnitude, Parsec, Minute And Second Of Arc
Document Summary
Stars and galaxies chapter 12: surveying the stars. We use the snapshot approach to capture the full range of stellar properties and lies by observing many stars at once. Luminosities of stars range from 0. 0001lsun to 100,000lsun: our sun is a mid-luminous star, yet it is brighter than the vast majority of stars in our galaxy. The magnitude system: apparent magnitude: the lower the number, the higher the apparent brightness of the star (e. g. sirius = -1. 46) Blue stars are hotter, red stars are cooler emit most strongly in its respective side of the spectrum. ***obafgkm oh be a fine guy, kiss me! Mass is the property that controls the star"s other properties. Most massive stars have a large amount of fuel, but consume it rapidly about 0. 001 x the sun"s. Lifespan depends on (amount of fuel) / (rate of use) or lifetime = mass/luminosity lifetime.
