any one with any advice..

james1986 wrote on Mar 22, 2008

i'm currently working using iraf, on my final year thesis..

trying to use iraf for differiental phototmetry..

i'm trying to get the instrumention magnitudes from a set of stars from a collection of images..

i have tried using imexamine but with 'a' and ',' and getting differenet values back..

i have also tried using the "phot" function in the noao=>digiphot=>apphot
but i have found that this will only return the value at an indiviual pixel, not for the whole star..

So what i'm wondering is how does one get the magnitude for a whole star??

Any help would be every much appreciated.. .

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Mike Fitzpatrick wrote on Mar 22, 2008

As a first step, see the photometry cookbooks available from http://docs.iraf.net As the next step, see the exercises that will lead you through some simple examples in ftp://iraf.noao.edu/iraf/misc/exer211.tar.Z (and exer211.readme) . The APPHOT and DAOPHOT packages should do what you want, see PHOTCAL for conputing transformations between instrumental and standard photometric systems.

-Mike

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Last post on Mar 22, 2008