Exam 13: Measuring the Properties of Stars

If Star A has a parallax angle of 3 arc seconds while Star B has a parallax angle of 9 arc seconds then we know that

If two stars are stacked vertically on a H-R diagram then they necessarily differ in their

The Sun is a G2V type star.

In the above H-R diagram sketch, which star is a blue giant?

If the distance between Earth and a star is measured using parallax measurements, how far apart in time should the two measurements be made to make the parallax measurement as accurate as possible?

The hydrogen absorption lines are the strongest in ___ type stars.

Which of the following stars has the hottest stellar surface temperature?

Hydrogen Balmer lines are essentially absent in the O and M type stars.

A star has a parallax angle of 0.2 arc seconds, which means it is at a distance of

The hottest (O and B type) stars are usually binary stars, while the coolest (M type) stars are usually single stars.

In the above H-R diagram, which main sequence star is bluish in color?

How does Rigel, a bluish star, surface temperature compare to Betelgeuse, a reddish star.

Yellow dwarfs have ____ spectral lines than red giants.

Stars on the main sequence have different luminosities because

Where are red giants on the H-R diagram?

Which of the following stars is hottest?

A star of absolute magnitude 1 is about 2.51 times more luminous than a star of absolute magnitude 2.

If it were possible to move a star closer to Earth then its apparent magnitude number would ______ while its absolute magnitude number would _______.

Stellar luminosities vary much more than stellar masses.

The H-R diagram is a plot of stars' ______________.