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T_FIND

T_FIND

Name


        T_FIND

Purpose


      Driver procedure (for FIND) to locate stars in an image.

Explanation


      Finds positive brightness perturbations (i.e stars) in a
      2 dimensional image. Output is to a FITS ASCII table.

Calling Sequence


      T_FIND, image, im_hdr, [ fitsfile, hmin, fwhm, sharplim, roundlim,
                                      PRINT = , /SILENT ]

Inputs


      image - 2 dimensional image array (integer or real) for which one
              wishes to identify the stars present
      im_hdr - FITS header associated with image array

Optional Inputs


      T_FIND will prompt for these parameters if not supplied
      fitsfile - scalar string specifying the name of the output FITS ASCII
              table file
      fwhm - FWHM to be used in the convolving filter
      hmin - Threshold intensity for a point source - should generally
              be 3 or 4 sigma above background level
      sharplim - 2 element vector giving low and high Limit for
              sharpness statistic (Default: [0.2,1.0] )
      roundlim - 2 element vector giving low and high Limit for
              roundness statistic (Default: [-1.0,1.0] )

Optional Input Keywords


      /PRINT - if set and non-zero then NSTAR will also write its results to
              a file find.prt. One can specify the output file name by
              setting PRINT = 'filename'.
      /SILENT - If this keyword is set and non-zero, then FIND will work
              silently, and not display each star found

Outputs


      None

Procedures Called


      CHECK_FITS, FDECOMP, FIND, FTADDCOL, FTCREATE, SXADDHIST, SXADDPAR,
      SXDELPAR, SXPAR(), WRITEFITS

Revision History


      Written W. Landsman, STX May, 1988
      Added phpadu, J. Hill, STX, October, 1990
      New calling syntax output to disk FITS table, W. Landsman May 1996
      Work with more than 32767 stars W. Landsman August 1997
      Converted to IDL V5.0 W. Landsman September 1997
      Remove obsolete !ERR system variable W. Landsman May 2000



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