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DAOPHOT-Type Photometry Procedures

APERCircular APERture photometry
CNTRDObtain the centroid of a star by locating where derivatives go to zero
DAOERFCalculate the intensity, (and optionally, the derivatives) of a bivariate Gaussian, integrated over pixels. Called by DAO_VALUE
DAO_VALUEObtain the value of a DAOPHOT PSF function at a given set of points
FINDFIND point sources within an image
GCNTRDDetermine centroid by Gaussian fits to the marginal X,Y distributions
GETPSFObtain a PSF (Gaussian + residuals) from isolated stars.
GROUPPlace stars with non-overlapping PSF's in distinct groups
MMMMean, Median, Mode) sophisticated sky background computation
NSTARSimultaneous PSF fitting of a group of stars
PIXWTCompute the area of the intersection of a circle on a rectangle
PKFITFit a Gaussian + residuals to a isolated star (called by GETPSF)
RDPSFRead a PSF file that was created by GETPSF into an IDL array.
RINTERCubic Interpolation at a set of reference points, optionally obtain derivatives. (in /image)
SKYCompute image sky level using MMM
SRCORCorrelate the source positions in two different lists
SUBSTARSubtract a scaled PSF at specified star positions
T_APERDriver procedure for APER with I/O to a disk FITS ASCII table
T_FINDDriver procedure for FIND with I/O to a disk FITS ASCII table
T_GROUPDriver procedure for GROUP with I/O to a disk FITS ASCII table
T_GETPSFDriver procedure for GETPSF with I/O to a disk FITS ASCII table
T_NSTARDriver procedure for NSTAR with I/O to a disk FITS ASCII table
T_SUBSTARDriver procedure for SUBSTAR with I/O to a disk FITS ASCII table