Astronomy Assignment 8

Which of the following objects has the smallest radius?

1.9 solar mass neutron star

Four main sequence stars with different masses are shown on the HR diagram. Which star will live the shortest time on the main sequence?

A

The evolutionary track of a low-mass star is shown on the HR diagram. Which position (A-D) on the track corresponds to the cut-away core diagram shown (where an arrow indicates fusion)?

A

Which curve shows the correct radius versus mass relationship for white dwarfs?

A

The evoloutionary track of a low-mass star is shown on the HR diagram. Which cut-away core diagram (A-D) correctly illustrates the source of fusion energy (an arrow indicates fusion) when the star is at the position indicated by the red dot?

C

Which plot correctly shows the relationship between a black hole's Schwarzschild radius and its mass?

C

What type of main sequence star is most likely to become a black hole?

an O-type star

When the Sun ascends the red giant branch

luminosity increases and temperature decreases

If you want to discover the youngest star you could find, which star group would be the best to search?

stellar associations

An astronaut falling feet first into a black hole would be "spaghettified" (stretched out) by

tidal forces - the pull of gravity on her feet is much greater than that on her head