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Chapter 12: Surveying the Stars
Terms in this set (20)
If a star was moved twice as far away, what would happen to it's appearance?
It would get four times fainter
How can you tell the temps of stars?
~Color- the hottest stars are red hot
~Color- the hottest stars are bluish-white
Why do stars of spectral types O and B show few absorption lines?
-Many atoms in these stars are ionized- have lost electrons- so can't absorb.
- Much of their absorption is in the ultraviolet
In binary stars, the orbital period depends on the masses of the stars and sizes of the orbits. Why is this so valuable to know?
This is the main way we determine the masses of stars
What is on the horizontal axis in an H-R diagram?
Color, Temp, Spectral type
What is on the vertical axis in an
Luminosity or apparent brightness
Stars spend about 90% of their lives
On the main sequence
In a random sample of stars in the Sun's neighborhood, you would expect about 90% of them
to be main sequence stars
To measure a star's true brightness, or luminosity, you need to know
Its apparent brightness and distance
What is the fundamental way of measuring the distance to nearby stars?
Which of the following is an everyday example of parallax?
-Hold your thumb out and blink your eyes. Your thumb moves more than the background.
-Driving down road a nearby fence appears to shift more than distance scenery
-Planets shift their position in the sky partly because the earth moves, shifting our position
-Stars shift their position at different times of the year, as Earth orbits the Sun
A star near the top of the main sequence has a mass about
60 times the Sun's mass
A star near the top of the main sequence has a luminosity about
10,000 times the Sun's luminosity
How would you expect the lifetime of a massive star near the top of the main sequence to compare to the Sun's?
Clusters in the disk of our galaxy with hundreds of stars in them are called
Clusters in the halo of our galaxy, way above and below the disk, with hundreds of thousands of stars in them are called
Why does a photograph of star field show some stars to be larger than others?
Photographs make brighter stars appear larger than fainter stars, although they should al be points of lights.
What do the colors of stars in the Hertzsprung Russell diagram tell us?
The surface temperature of the star
Two stars that look very different must be made of different kinds of elements
No, stars appear different due to their different ages and masses, not composition
Stars that begin their lives with the most mass live longer than less massive stars because it takes them a lot longer to use up their hydrogen fuel.
No, more massive stars are much more luminous than low mass stars and use up their hydrogen faster, even though they have more of it.
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