Ast 180 Chapter 12 Homework Study Guide Rated A+

A white dwarf cannot a. have an internal pressure greater than that of the Sun. b. have more than 1.4 solar masses. c. cool off so that it won't be visible. d. cause explosive outbursts from increases in mass. {Ans: have more than 1.4 solar masses}Normal matter, in contrast to electron degenerate matter, is filled with mostly a. neutrons. b. empty space. c. protons. d. electrons. {Ans: empty space}A Roche lobe is a. the volume at which fusion of carbon takes place in the core of a white dwarf. b. the "figure eight" volume of space around binary stars that defines their gravitational influence. c. an exploding red giant. d. the distance at which tidal forces rip apart a comet that passes near a star. {Ans: the "figure eight" volume of space around binary stars that defines their gravitational influence}A horizontal branch star is characterized by a. hydrogen burning in a shell only. b. helium burning in the core and hydrogen burning in a shell. c. hydrogen burning in the core and helium burning in a shell. d. helium burning in a shell only. {Ans: helium burning in the core and hydrogen burring in a shell}The