[Aavso-photometry] Atmospheric extinction questions

[Jim Roe]

Gary Walker wrote:
> Hello Jim;
> 
> You will see a difference.  From Bruce Gary's book on ExoPlanet Light 
> Curves, for a Type A2, 8000K and a type K3, 4500K, you will see 
> approximately 6 millimags per air mass.  Other differences accordingly.  
> How much are you seeing?
> 

Actually, I've decided the trend I saw was due to the target itself - it 
IS a variable star after all!  Again, the target and comp star have very 
similar B-V (and V-R) values.

Is that book available on line?  I've been sending Bruce ExoPlanet Light 
curves and was wondering about how he corrects them for air mass.

Jim Roe [ROE]