Hi,
You should use the "Multi-Aperture" feature of AstroImageJ
(AIJ) to do relative photometry, which will remove much of the sky
effects. To start Multi-aperture, use the 7th icon from the right
side of the main AIJ toolbar (It looks like two dots with red
rings around them). After setting up your aperture sizes, etc., in
the Multi-Aperture setup panel, you will need to left-click on
your target star of interest first, then left-click on one or more
additional stars as reference stars. Then press enter (or
right-click) to start processing all images. AIJ will do the
division automatically, and the results can be plotted by using
the data set column name "rel_flux_T1" in the measurements table.
You can plot this directly in AIJ using the Multi-plot feature
(5th icon from right which looks like a red curve on x-y axis), or
save the measurements table to a file and plot it in your favorite
plotting program.
Karen
On 6/28/2013 10:44 AM, Kalvin Ogbuefi [via AstroImageJ] wrote:
Hello!
I have a question. I recently tried to plot a light curve of a
transit the other day and it looks as though the effects of the
sky is messing with the light curve of our target object. My
professor, who I'm working with, suggested that we take the flux
of the target object (exoplanet star) and divide it by one of the
comparator stars to eliminate the sky effect. My only question is
how do you do this on AstroImageJ?
-Thank You!
Locked
