AST201H5 Lecture Notes - Lecture 6: Brown Dwarf, Star Formation, Protostar
Document Summary
Temp of stars: use laws of thermal radiation or mixture of atoms, mulecules and ions -> 3000 to 50000 k. Masses of stars: newton"s version of kelper"s 3rd law using double stars or exoplanets -> 0. 1x tp 100x msun. Hertzsprung russel h-r) diagraml plot lstar and tstar. Main sequencel diagonal band from cool faint stars to hot, bright strs. Mass is the key quantity, controls fusion -> luminosity and temp. Lifetime of main sequence stars = mass=fuel/ luminosity=rate of use greater mass-> greater use of fuel -> shorter life. Red giant stars, supergiant stars, white dwarf stars. Two types of clusters: open clusters - 100s -> 1000s stars. Open cluster evaporates over time: globular clusters - 100000s to millions of stars. All the stars in a clusters share many properties. They all are at the same distance from us. They all have the same composition, age. Open clusters have high luminosity main sequence stars -> must be young
