Astronomy Review Questions

We know that giant stars are larger in diameter than the sun because

• they are more luminous but have about the same temperature.

• they are less luminous but have about the same temperature.

• they are hotter but have about the same luminosity.

• they are cooler but have about the same luminosity.

• they have a larger absolute magnitude than the sun.

Giant stars are

• more luminous than the sun.

• larger in diameter than the sun.

• cooler than B stars.

• located above the main sequence stars in the H-R diagram.

Which star in the diagram above is most like the sun?

• Alnilam

• Antares

• Arcturus

• HR 5337

• Sirius B

Which star in the diagram above has the greatest surface temperature?

• Alnilam

• Antares

• Arcturus

• HR 5337

• Sirius B

Which of the stars in the diagram above has the largest radius?

• Alnilam

• Antares

• Arcturus

• HR 5337

• Sirius B

In an H-R Diagram, stars with the smallest radius are found in the _______ of the diagram.

• center

• upper left corner

• upper right corner

• lower left corner

• lower right corner

Spectroscopic and eclipse duration observations of an eclipsing binary star can enable astronomers to calculate____________ of its individual stars.

• the masses

• the sizes

• both a and b

• neither a nor b

Doppler shift observations of a spectroscopic binary star can enable astronomers to calculate ____________ of its individual stars.

• the masses

• the sizes

• both a and b

• neither a nor b

Binary (double) stars can be detected by

• being seen as two separate stars with a telescope.

• one star traveling a wiggly proper motion path across the sky.

• one star dimming abruptly as another passes in front of it.

• pairs of absorption lines seen in the spectrum of what appears to be one star.

• all of the above

The binary star, Mizar A, is shown with the motion of the members around one another. The mass of a visual binary pair of stars can be obtained from

• the time in years for them to orbit one another.

• the size of their orbit.

• their location in space.

• both a and b