Tim Little wrote:
 > Mean surface absolute temperatures go roughly with the fourth root of
 > irradiance...

Hello, stranger! Welcome back.

Yes, Stefan-Boltzmann is a very useful starting point.
Albedo and greenhouse effect will modify things a bit.

 > Actually hotter stars would be easier to block, since a planet of
 > given starting temperature would be further away with a lesser angular
 > diameter of star.

For planets of similar temperature/irradiance, assuming stars of the
same size, yes.

Luminosity varies with (star radius)^2 and (Temperature)^4, right?.

Rob O'Connor