Ubc Astr 205 Study Guide Graded A+

What is the definition of a parsec? {Ans: The distance at which the length subtended by one arcsecond is one AU.`}Describe the life cycle of a low mass star. {Ans: Protostar, main sequence H burning, red giant branch, [Helium Flash], horizontal branch, asymptotic giant branch, planetary nebula, white dwarf}Describe the process of massive star evolution {Ans: Gravity allows a T increase and thus C fusion, then higher orders of fusion. Finally, Fe fission occurs and rapid collapse begins}Define the two conditions of a star. {Ans: 1) bound by self-gravity, 2) radiates energy largely supplied by an internal source}What is a non-rotating black hole called? {Ans: A Schwarzschild Black Hole}How does a low mass star evolve off the main sequence? {Ans: µ slowly increases from 0.6 to 1.34, core contracts and luminosity increases, an H-burning shell forms, radius increases x 100, L increases x 1000}