Data characterization using artificial-star tests: performance evaluation

Details Data characterization using artificial-star tests: performance evaluation Data characterization using artificial-star tests: performance evaluation

2010-11-17

arxiv.org/abs/1011.3892v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

23 pages, 10 figures, accepted by PASP

Scientific paper

Traditional artificial-star tests are widely applied to photometry in crowded stellar fields. However, to obtain reliable binary fractions (and their uncertainties) of remote, dense, and rich star clusters, one needs to recover huge numbers of artificial stars. Hence, this will consume much computation time for data reduction of the images to which the artificial stars must be added. In this paper, we present a new method applicable to data sets characterized by stable, well-defined point-spread functions, in which we add artificial stars to the retrieved-data catalog instead of the raw images. Taking the young Large Magellanic Cloud cluster NGC 1818 as an example, we compare results from both methods and show that they are equivalent, while our new method saves significant computational time.

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