Exam 13: Measuring the Properties of Stars

If a star exhibits no Doppler shift in its emitted light, it must be true that _______________.

Wien's law can only tell us about the surface temperature of a star, not the temperatures of the star's interior.

What is the main sequence?

The H-R diagram is a diagram plotting the stars according to their

The luminosity of a star is determined by the star's _____________ and _____________.

Two stars that have the same absolute magnitude also have the same luminosity.

In the above H-R diagram sketch, which star is a red dwarf?

In ___ stars most of the electrons in the hydrogen atom are above level 2 and in ___ stars most of the electrons are below level 2, therefore the _____ are essentially absent in both types.

In the above H-R diagram sketch, which star is a white dwarf?

What was Cecilia Payne's discovery?

One parsec is equal to 3.26 light-years.

The sequence OBAFGKM orders the stars in decreasing temperature and decreasing mass.

A binary star is a pair of stars that orbit around each other. By detecting this orbital motion, and using Kepler's laws and the law of gravitation, one can directly measure the stars' ____.

Luminosity (absolute brightness) of a star depends on its ___________.

A main sequence star has 3 times the mass of the Sun. Using ____ we find that the star is ___ times more luminous than the Sun.

Binary star systems are very important because they allow

The apparent magnitude of a star tells us how bright the star would appear if placed at a distance of 10 pc from the Sun.

How does the spectrum of a star depend on its surface temperature?

The Balmer lines correspond to wavelengths in the ____ part of the spectrum of a(n) ____ atom.

In the above H-R diagram, which main sequence star is biggest in size?