Re: Plot seeing profile

Posted by guy on Aug 08, 2017; 10:40am
URL: http://astroimagej.170.s1.nabble.com/Plot-seeing-profile-tp727p732.html

Hi Karen,

Thanks a lot for your answer,

1) I run AIJ 3.2.0 on Linux and I think I found the reason for the Radius [inches] issue : when I open a CR2 Canon Raw image (through a dcraw plugin) I get "inches", and when I open a fits image such as your WASP-12b, I have "pixels" on the x-axis (no big deal anyway)

2) Oops ! you are right, the info I requested was already in the A.4 in your paper. I understand that 1.7**2 = 2.55**2 - 1.9**2, but what happen if I change the settings, do I have to maintain a strict equal number of pixels in the aperture and sky-background annulus ?

3) Yes "List" works, even on an image from a CR2 file : see image below, which is a profile of an uncalibrated and saturated star image with noisy surroundings, in that case I got a file with ~7500 pixels listed. Unfortunately "List" does not work on an image of the solar disk which has a huge FWHM of 1600 pixels: the plot is displayed, after quite a long time, but when I click "List" AIJ hangs. I understand it would produce a file with several million lines. Is it possible to get only the Magenta line in x-y form (since it is the quantity I am interested in and would be quite a small file)?

Regards,
Guy