Science Test Chap 23
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Describe the relation between a star's distance and its parallax?
- Closer the star the greater the parallax
- Futher the star the smaller the parallax
Describe a light year
- Is a distance that light travel a year.
- 1 light year= 9.5 trillion km
List 3 factors that control the magnitude of a star as seen from Earth
What causes the difference between a star's apparent and absolute magnitude?
What us the difference between appare and absolute and magnitude?
- Apparent magnitude is the stars brightness when a star is view from Earth.
- Absolute is the true brightness
What standard distance is used for absolute magnitude?
32.6 light years
Compare the wavelengths of the "hot" and "cool" stars.
- Hot=short wavelength
- Cool=long wavelength
What is the approximate surface temperture of a star with the following color?
Red:(cool star) Temperture is less than 3,000K
Yellow:(Sun) Between 5,000-6,000 TempertureK
Blue:(Hot star) Temperture above 30,000K
List two properties of stars that are used to construct an H-R Diagram.
Brightness:(absolute magnitude)= Lumniosty
What category of star is the sun?
Where are the main-sequence, red giants, and white dwarfs located on the H-R Diagram?
Main-Sequenve in Band through center of H-R diagram
Red Giant in upper right on the H-R diagram
White dwarf in lower central area on the H-R diagram
Make a generalization relating the mass and luminosity of mani-sequence stars.
Main sequence star is Average mass and Average Brightness
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