ASTA02H3 Lecture Notes - Main Sequence, Number Density, Boltzmann Constant
Document Summary
Near the end of the lives of main sequence stars. M stars are older than the universe. Currently no red dwarfs in their final stages. 90% of lifespan spent in the main sequence stage. 10% of lifespan spent in stages other than the main sequence stage. *make use of the constant of proportionality for (such) comparison questions. Note: the second last equal" sign is similar to: One source of energy for main sequence stars. Decrease in pressure leads to a decrease in number density ( ) Note: radius is to the power of two. Entire evolution of a single star (not in a binary system) Determined by its mass and its chemical composition. Only hydrogen and helium (were formed) from the big bang. Traces of carbon and etc. in new generations of stars. The more massive a star, the faster it dies. Requires hot regions to transfer energy to cold regions.
