Logging In
In your console write:
ssh student@cog-nfs.mpe.mpg.de Password: teleskop
Once you're logged in type "bash" and hit enter.
Now you can cd in your Groups directory with:
cd ~/observations/GROUPNAME/
Create Data Structure
In order to calibrate to pictures taken with the telescope we use several small programs, all taken from www.astromatic.net. You can have a look at the website for further details. These programs are all bundled into one script called make-cmd. For this script to work we need a folder structure like this:
* Target 1 ( e.g. M13 )
- R
- G
- B
- ...
* Target 2 ( e.g. M32 ) * Bias * Dark * Flat
- R
- G
- B
- ...
Please cp the needed scripts into your folder:
cp ~/default/* ~/observations/GROUPNAME/
Running the Data Reduction
To start the post processing run the script \textbf{make-cmd} in the main folder with the arguments specifying the target folder and the output folder
./make-cmd -t=M13 --prefix=p --rec=16:41:40 --radius=2 --dec=36
After the script is done with one cluster you need to open "topcat" and load the coadded catalogues. These are save in the output folder under each color as color/color.cat. Use the tuple/triple match function in topcat, giving the x/y sky coordinates. These should be found in column 10 and 11
After the mathing catalogue is found, save it into your working directory. The python script "read_cat.py" can be executed now, giving the CMD of the chosen cluster.
./read_cmd.py -i CMDDATAFILE -o file.pdf
From here you can repeat the process for every other cluster you took pictures of.
In order to find the relative ages of the clusters, you need the CMD's of each.