[Aavso-photometry] Atmospheric extinction questions

[Gary Walker]

 Hello Jim

Bruce's book is only available on line.? Its 135 pages.? He also has a spreadsheet online that one can download which does the extinction correction, as well as other things.? He also uses an artificial star, which allows maxim to get true differential mags for everything.? Its quite neat.? 


 


Thanks

Clear Skies
Gary Walker
Maria Mitchell Observatory
4 Vestal Street
Nantucket, Mass  02554

 


 

-----Original Message-----
From: Jim Roe <jroe at jamesroe.com>
Cc: aavso-photometry at mira.aavso.org
Sent: Tue, 13 May 2008 11:21 pm
Subject: Re: [Aavso-photometry] Atmospheric extinction questions












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]
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