How Can Luminosity and Temperature Ratios Be Deduced in Binary Star Systems?

[Darklord]

In a particular binary star system, star A has apparent brightness 8x10^(-13) and star B has apparent brightness 2x10^ (-14).

a) Explain how it is possible to deduce that star A has a higher luminosity than star B.

b) The surface area of star B is 10 000 times smaller than that of Star A. Calculate the ratio
surface temperature of star B/ surface temperature of star A

Cheers.

 

[hage567]

Hi Darklord,

For homework questions, you need to show your attempt at a solution to get help.

Read https://www.physicsforums.com/showthread.php?t=5374 for the rules about homework help.

 

[Darklord]

a) Because Star A's temperature may be higher and the body my be larger than Star B.

b) I got no idea how to work it out. I wasn't if i have to find all the unknowns.