Exam 17: The Stars: Giants, Dwarfs, and the Main Sequence

In a visual binary system with circular orbits, if in 20 years the two stars' position angleshave shifted by 30 degrees, the pair's period must be:

How is distance determined to the nearest stars? How far out can this technique be applied?How many stars can be measured in this way?

On the H-R diagram, white dwarfs like Sirius B and Procyon B lie:

Like the Sun, main sequence stars are converting hydrogen into helium in their cores.

On the H-R diagram, most bright naked eye stars would lie at the ________.

Star A and star B both have an apparent magnitude of 4.0, but star A has an absolutemagnitude of 1.0 and star B has an absolute magnitude of 7.0. Which statement below is correct?

In what range of masses are most stars found? What about the range in luminosity? How arethey related?

At the distance of Jupiter (6 times further away from the Sun than Earth)the amount ofsunlight received per square centimeter is different by what factor?

The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature.

The proper motion of a star is its true velocity through space.

On the H-R diagram, red supergiants like Betelguese lie:

High mass stars provide most of the mass and most of the light in galaxies.

Star A is a main sequence star of spectral type G5 and star B is a red giant of spectral typeK2. Which statement below is correct?

From hottest to coolest, the seven letters for the star types are ________.

How can a white dwarf be hotter than our Sun, yet much less luminous?

What is the typical main sequence lifetime of an M-type star?

If a star appears to move relative to other stars over a one-year period, this motion is due tothe star's

For luminosity classification, fat stars have skinny spectral lines.

If two stars are the same size and one is twice the temperature of the other, how much moreluminous is the hotter one?

Hydrogen lines are weaker in both very hot and very cool stars.