Chapter 17-18

The hottest stars typically appear...

• red

• yellow

• blue-white

• orange

which factor does affects the apparent brightness of a star

• distance from earth

• luminosity

• color

• temperature

what is the correct order of spectral classes from hottest to coolest

• O, B, A, F, G, K, M, L, T, Y

• Y, T, L, M, K, G, F, A, B, O

• O, A, B, F, G, M, K, L, T, Y

• B, A, O, F, G, K, M, L, T, Y

what is sprectroscopic binary

• two stars seen seperately

• a star orbiting a planet

• two stars detected through their spectrum

• a single rotating star

the differences in star spectra are mainly due to

• chemical composition

• size

• temperature

• distance

where do most stars lie on the H-R diagram

• on the main sequence

• in the white dwarf region

• as giants

• as supergiants

what determines a star's position along the main sequence

• distance

• temperature

• mass

• spectral class

which type of stars are the most common

• high mass and high luminosity

• low mass and low luminosity

• brown dwarfs

• white dwarfs

what does the H-R diagram plot

• star size vs color

• temperature vs brightness

• luminosity vs surface temperature

• spectral type mass

how does the radial velocity of a star measured

• apparent brightness

• color

• line shifts via doppler effect

• H-R diagram