Re: Detrending Airmass

Posted by mtsacobservatory on Aug 12, 2020; 2:56pm
URL: http://astroimagej.170.s1.nabble.com/Detrending-Airmass-tp1437p1439.html

Hi Karen,

I tried detrending the target delta Scuti star with airmass using two different fit modes (the full curve transit dip that you suggested, and also the full curve flat line), but both skewed the lightcurve.  I also tried running an airmass detrend on two of the comp stars.  Even if that detrending doesn't automatically apply to the rel_flux_T1, it should at least give us an idea if airmass was a significant problem, right?  Both comp stars look fairly flat, as they should, and the airmass coefficients I got were -0.0012 and -0.0045.  Is there a reasonable range that people use to know if this value is acceptable?  

Thanks again for your help,

Jessica Draper
Mt. SAC Observatory
Walnut, CA