Stellar Parallax

Multiple Choice

Stellar parallax is used to measure the

• sizes of stars.

• distances of stars.

• temperature of stars.

• radial velocity of stars.

• brightness of stars.

Multiple Choice

The angle of stellar parallax for a star gets larger as the

• distance to the star increases.

• size of the star increases.

• length of the baseline increases.

• wavelength of the light increases.

Multiple Choice

In a model of the solar system in which the Sun is a marble, what is Earth?

• a grain of sand orbiting 1 m away.

• a grain of rice orbiting 1 m away

• a grain of sand orbiting 270 m away

• a grain of rice orbiting 270 m away

Multiple Choice

Luminosity (_____) is a measure of the total power radiated by a star.

• absolute magnitude

• absolute brightness

• proper magnitude

• proper brightness

Multiple Choice

Apparent luminosity is measured using a magnitude scale which is related to

• the color of the star.

• the distance of the star from Earth.

• our perception.

• temperature of the star.

Multiple Select

Which of the following do we need to calculate a star's absolute luminosity?
*There are 2 correct answers.

• its apparent magnitude

• its proper magnitude

• its distance from Earth (us)

• its direction from Earth (us)

Multiple Choice

The color of a star is an indication of the star's

• age.

• composition.

• temperature.

• orbit.

Drag and Drop

Red stars are ​

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while blue stars are ​

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.

Drag these tiles and drop them in the correct blank above

cool

hotter

hot

cooler

Multiple Choice

Stellar spectra are NOT as informative as blackbody curves.

• This statement is FALSE.

• This statement is TRUE

Match

Match the following

• Radius between 10 and 100 times that of the Sun's

• Radius that is MORE than 100 times the Sun's

• Radius that is equal to, or LESS than the Sun's

Giant Star

Supergiant Star

Dwarf Star

• Giant Star

• Supergiant Star

• Dwarf Star

Multiple Choice

The darkened curve on the H-R diagram is called the ___ sequence.

• color

• main

• temperature

• stellar

Multiple Choice

The H-R diagram plots Stellar Luminosity against

• star color.

• star mass.

• surface composition.

• surface temperature.

Multiple Choice

What percentage of stars lie on the Main Sequence of the H-R diagram?

• 9%

• 10%

• 90%

• 100%

Reorder

Reorder the Spectroscopic Parallax steps in the correct order:

• Measure the star's apparent magnitude and spectral class

• Use the spectral class to estimate luminosity

• Apply the inverse-square law to find distance

1

2

3

• 1
• 2
• 3

Multiple Choice

Visual binary stars can be measured

• directly.

• indirectly.

• when in transit.

• when they wobble.

Multiple Choice

What is the MAIN determinant of where a star will be on the Main Sequence?

• color

• orbit

• mass

• temperature

Drag and Drop

The more massive stars have the ​

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lifetimes.

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shortest

longest