Physics – Optics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasp..121..767b&link_type=abstract
Publications of the Astronomical Society of the Pacific, Volume 121, issue 881, pp.767-777
Physics
Optics
3
Data Analysis And Techniques
Scientific paper
We propose a new approach to differential astrometry and photometry of faint companions in adaptive optics images. It is based on a prewhitening matched filter, also referred to in the literature as the Hotelling observer. We focus on cases where the signal of the companion is located within the bright halo of the parent star. Using real adaptive optics data from the 3 m Shane telescope at the Lick Observatory, we compare the performance of the Hotelling algorithm with other estimation algorithms currently used for the same problem. The real single-star data are used to generate artificial binary objects with a range of magnitude ratios. In most cases, the Hotelling observer gives significantly lower astrometric and photometric errors. In the case of high Strehl ratio (SR) data (SR≈0.5), the differential photometry of a binary star with a Δm=4.5 and a separation of 0.6″ is better than 0.1 mag; a factor of 2 lower than the other algorithms considered.
Burke Daniel
Dainty Chris
Devaney Nicholas
Gladysz Szymon
Roberts Lewis
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