Computer Science – Performance
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sf2a.conf..407d&link_type=abstract
SF2A-2002: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 24-29, 2002, Eds.: F. Combes and D. Barret,
Computer Science
Performance
Scientific paper
We assess the relative performances of the softwares DAOPHOT, DAOPHOT/ ALLSTAR, CAPELLA, SEXTRACTOR for stellar fields with irregular backgrounds and asymmetric PSFs. The first three packages use PSF fit- tings, the fourth performs fixed aperture photometry and a small aperture was used in order to minimize the contaminating fluxes. A typical extragalactic stellar field has been used to built synthetic counterparts in order to test the photometric accuracy with respect to the blend extent. The results show in which cases DAOPHOT, DAOPHOT/ ALLSTAR and SEXTRACTOR overestimate the fluxes of blended stars. SEXTRACTOR results dispersions are near the ALLSTAR ones, but as we can expect, systematic overestimation appears for the severely blended stars. For stars merged in the wings of brighter stars, CAPELLA reaches the best accuracy. For isolated and moderately blended stars, ALLSTAR, CAPELLA and SEXTRACTOR results are near.
Dubout-Crillon R.
Llebaria Antoine
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