iraf.net

[b:30bd99962a]From: [/b:30bd99962a]Philip Massey <massey@lowell.edu ([email]massey@lowell.edu[/email])>
[b:30bd99962a]Date: [/b:30bd99962a]November 14, 2005 1:02:07 PM MST
[b:30bd99962a]To: [/b:30bd99962a]Frank Valdes <valdes@noao.edu ([email]valdes@noao.edu[/email])>
[b:30bd99962a]Subject: [/b:30bd99962a][b:30bd99962a]Re: ellipticity and position angle[/b:30bd99962a]
Thanks for pointing me at this.  I actually just threw up my hands and wrote my own little FORTRAN code, whichwas fine, but this is good to remember for the future.thanks,
philOn Nov 14, 2005, at 12:53 PM, Frank Valdes wrote:
[quote:30bd99962a]Hi Phil,
Unless you want me to put together a reply on IMEXAM I suggest you look at the task PSFMEASURE.  In the current version of IRAF it is part of the OBSUTIL package.  To do the non-interactive job you want you would make a text file of x/y for all your stars. ob> psfmeasure starfield imagecur=mystars.dat >G dev$null
** Select stars to measure with 'm' and finish with 'q'.
** Additional options are '?', 'g', and :show.
NOAO/IRAF V2.12.2a-EXPORT valdes@tucana.tuc.noao.edu ([email]valdes@tucana.tuc.noao.edu[/email]) Mon 12:47:40 14-Nov-2005          Image  Column    Line     Mag    FWHM   Ellip      PA SAT
      starfield  164.79  184.59    0.00   2.206    0.06     -23  Full width at half maximum (FWHM) of 2.2061This is with the default parameters.  Note the redirection of the graphics to null file.  You could redirect the graphics to a metacode file viewable with (e.g.) GKIMOSAIC.  However for 30,000 stars I don't think you want that.Let me know if you have questions or if you prefer to use IMEXAM.  The algorithms in PSFMEASURE are largely the same as in IMEXAM.Yours,
Frank
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