Stellar Properties & the HR Diagram Review

Which of these shows a star with a luminosity 30 times higher than our Sun's luminosity?

• 30 L_sun

• L₃₀

Which star shown below is brightest?

• a magnitude -1 star

• a magnitude 1 star

• a magnitude 2 star

• a magnitude 3 star

What is the correct order of spectral class - from hottest to coolest?

• B F G K O A M

• O B A F G K M

• M K G F A B O

How does the mass of a hot, bright main sequence star compare to a cool, faint main sequence star?

• They have more mass

• They have the same mass

• They have less mass

Our sun is currently a main sequence star. All main sequence stars fuse ____ in their cores.

• helium into hydrogen

• hydrogen into helium

• helium into carbon

Someday the sun will leave the main sequence and become a red giant star. As a red giant, it will be fusing ___ in its core. It will also swell up, becoming larger in diameter. It also cools.

• helium into hydrogen

• hydrogen into helium

• helium into carbon

After spending some time as a red giant, the sun will shed its outer layers and expose its core. All fusion stops and it "dies"becoming a white dwarf. These objects are then considered to be ___.

• black holes

• neutron stars

• stellar corpses

A, D, and E are all on the main sequence. What are they fusing in their cores?

• H into He

• H and He into Li

• He into C

What small, hot, faint objects are found at B?

• neutron stars

• black holes

• white dwarfs

• brown dwarfs

What objects are found at C?

• Blue giants

• Red giants

• White dwarfs

• Main sequence stars