Exam 8: The Family of Stars

For what kinds of stars are the masses of stars in the H-R diagram "orderly"? For what kinds of stars are they disorderly? In other words, could you guess the mass of a star from its location (luminosity, temperature) on the H-R diagram?

We can find the masses and diameters of stars that are in eclipsing binary systems.

Diagram 8-1 Use the H-R diagram below to answer the following question(s). -Which of the stars in Diagram 8-1 has the largest absolute visual magnitude?

From the mass-luminosity relation, a 2-solar-mass star on the main sequence would have a luminosity of approximately ____ solar luminosities.

The ____ of a star is a measure of the total energy radiated by the star in one second.

To observe a spectroscopic binary, we must be able to see both stars individually.

To observe a visual binary, we must measure radial velocities.

How do humans use their eyes to measure relative distance by parallax?

The absorption lines in the infrared portion of the spectrum of a star that are produced by hydrogen are from the

How does an H-R diagram make it clear that giant stars are larger than main-sequence stars of the same temperature?

Stars in the upper right part of the Hertzsprung-Russell diagram are always ____ when compared to stars near the middle of the diagram.

The absorption lines in the visible portion of the spectrum of a star that are produced by hydrogen are from the

Why are the Balmer lines weak in the spectra of hot and cool stars, but strong in the spectra of intermediate-temperature stars?

What information about orbital inclination can we get from visual binaries, spectroscopic binaries, and eclipsing binaries?

Five stars and their spectral types are given below. Which star would have the lowest surface temperature?

Table 8-1 Use the chart below to answer the following question(s). -From the data given,, which star in Table 8-1 has the greatest surface temperature?

Which stars always have large positive absolute magnitude?

To determine the orbital period of a visual binary, we must measure

What would the spectrum of hydrogen look like if we could see into the ultraviolet?

How does absolute visual magnitude tell us the intrinsic brightness of a star?