SExtractor Draft - METU Astrophysics

10INTERP TYPE ALL keywords (n ≤ 2) Interpolation method from thevariance-map(s) (or weight-map(s)):NONE– no interpolation,VAR ONLY – interpolate only the variance-map(detection threshold),ALL– interpolate both the variance-mapand the image itself.MAG GAMMA float γ of the emulsion (takes effect inPHOTO mode only).MAG ZEROPOINT float Zero-point offset to be applied to magnitudes.MASK TYPE CORRECT keyword Method of “masking” of neighboursfor photometry:NONE– no masking,BLANK– put detected pixels belonging toCORRECTneighbours to zero,– replace by values of pixels symetricwith respect to the source center.MEMORY BUFSIZE — integer Number of scan-lines in the imagebuffer.Multiply by 4 the frame widthto get equivalent memory space inbytes.MEMORY OBJSTACK — integer Maximum number of objects that theobject-stack can contain. Multiply by300 to get equivalent memory space inbytes.MEMORY PIXSTACK — integer Maximum number of pixels that thepixel-stack can contain. Multiply by16 to 32 to get equivalent memory s-pace in bytes.PARAMETERS NAME — string The name of the file containing the listof parameters that will be computedand put in the catalogue for each object.PHOT APERTURES — floats (n ≤ 32) Aperture diameters in pixels (used byMAG APER).PHOT AUTOPARAMS — floats (n = 2) MAG AUTO controls: scaling parameterk of the 1st order moment, and minimumR min (in units of A and B).PHOT AUTOAPERS 0.0,0.0 floats (n = 2) MAG AUTO minimum (circular) aperturediameters: estimation disk, andmeasurement disk.PHOT FLUXFRAC 0.5 floats (n ≤ 32) Fraction of FLUX AUTO defining eachelement of the FLUX RADIUS vector.PIXEL SCALE — float Pixel size in arcsec (for surfacebrightness parameters, FWHM and s-tar/galaxy separation only).SATUR LEVEL — float Pixel value above which it is consideredsaturated.SEEING FWHM — float FWHM of stellar images in arcsec (onlyfor star/galaxy separation).