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