PHYS 1201 Study Guide - Final Guide: Radiation Zone, Photosphere, Spacetime
Document Summary
Nuclear fusion can make sun shine for next 10 billion years. Temp rise fusion increases core expands/cools. Distance & apparent brightness/apparent & absolute magnitude (smaller # is brighter) High mass stars: radius: high luminosity, large radius, hotter, short-lived, bluer & rare. Low mass stars: low luminosity, small radius, cooler, long-lived, redder & plentiful, burning hydrogen into helium in their cores, stellar cores for non ms stars = older stars that ran out of hydrogen. Main sequence stars may be burning due to another process. Clusters: many are in instability strip, brightest stars are called cepheid variables, open clusters: thousands packed loosely, globular clusters: millions packed densely the clusters most massive ms star. Gravity beats internal pressure cloud contracts & breaks up into many regions that become new stars. Gravity pushes enough on the core to raise. Highest mass possible the temp & pressure enough for fusion to begin. Higher (lower) mass higher space and win against gravity.
