NAME

radplt -- plot a radial profile of a stellar image

USAGE

radplt input x_init y_init

PARAMETERS

input

the list of images which contain the star whose profile is to be plotted

x_init

the approximate column coordinate as a starting point for the centering

y_init

the approximate line (row) coordinate as a starting point for the centering

cboxsize = 5

the size of the extraction box to be used during the centering process

rboxsize = 21

the size of the extraction box to be used for the radial profile. The profile will extend to sqrt(2) * rboxsize / 2. This is the length of the diagonal from the box center to a corner, and corresponds to about 14 pixels for the default value.

DESCRIPTION

Given the approximate coordinates of the center of a star, (x_init, y_init), RADPLT will compute a more accurate center using the algorithms described in the Kitt Peak publication "Stellar Magnitudes from Digital Images" under the Mountain Photometry Code section and then plot the intensity values in the profile extraction box as a function of distance from the center. This is effectively a radial profile.

The values for both box sizes should be odd.

EXAMPLES

The following example plots the profile of a star near (123, 234):

cl> radplt m92red 123 234

BUGS

The routine will probably fail if the desired star is within 2 or 3 pixels of the image boundary.

USE INSTEAD

plot.pradprof

SEE ALSO

imcntr