Astr 3000 Contemporary Astronomy
Fall 2017  Assignment 12
due Monday December 4^{th} 2017
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Assignment

Stars A and B are equally bright, but star B is 6 times further away

Which one is dimmer from our point of view?

By how much?

Star C has only half the brightness of star D, and is 3 times further away

Which one is dimmer from our point of view?

By how much?

Star E has five times the brightness of star F, and is 3 times further
away

Which one is dimmer from our point of view?

By how much?

Star G is six times the radius of star H, and has a surface temperature
twice as high

Which one produces the most amount of light?

By what factor?

Star K is six times the radius of star L, but has a surface temperature
only half that of star L

Which one produces the most amount of light?

By what factor?

Compared to star M, star N is three times bigger and eight times further
away. The surface temperature of start M is 4000 K, whereas the surface
temperature of start N is 5000 K

Which one is dimmer from our point of view?

By how much?
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