Exam 11: Measuring the Stars: Giants, Dwarfs, and the Main Sequence

The Doppler shift is used to find

Combining a star's proper motion and its distance allows us to determine its transverse velocity.

The largest supergiants, like Deneb and Rigel, are luminosity class _ .

A type B9 star is hotter than a type A0 star.

Describe the various ways that stellar masses can be determined in binary star systems.

The type of binaries where we can find their sizes have their orbits almost as seen from the Earth.

Every solar type star ever formed still shines in the Milky Way Galaxy, yet our naked eyes see stars that generally are much younger than the Sun. Explain.

Why must both parallax and proper motion be known to give transverse velocity?

Main sequence stars lie at the top right corner of the H- R diagram.

Luminosity class V stars are larger than class Ia stars.

Fewer than 100 stars lie within 5 parsecs of the Sun.

In general, the more massive the star, the _ its lifetime.

The complete spectral classification of our Sun is .

Which of these binaries would appear most similar in color telescopically?

Why don't stars less massive then type M exist?

Hydrogen lines are strongest in class A stars.

A stars total velocity is a combination of its and _ velocities.

In general, as you examine stars on the main sequence, going from bottom right to top left, their stellar radii _ .

The absolute magnitude of a star is how bright it appears if viewed from a distance of light- years.

Main sequence stars are fusing hydrogen into helium in their cores.