Computer Science – Performance
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..442..583m&link_type=abstract
Astronomical Data Analysis Software and Systems XX. ASP Conference Proceedings, Vol. 442, proceedings of a Conference held at Se
Computer Science
Performance
Scientific paper
We discuss the methods of reliable cross-matching of large photometric catalogs at various wavelengths (SDSS, GALEX, 2MASS, USNO-B1, etc.) for the purpose of collecting and using multicolor (from UV to IR) photometry of cross-matched objects. We pay special attention to the performance issues and describe several approaches for the speed-up of the match, involving construction of various spatial indices, both planar and spherical. We discuss the means of dealing with ambiguous (multi-candidate) matches using a-priori information. Color-index diagrams, constructed with the obtained photometry, are powerful tools for parameterization of stars. Particularly, detection of a composite flux in photometry can serve as an indication of a photometrically unresolved binarity and can contribute to the parameterization of the components of binary systems. Interstellar extinction values for cross-matched stars can also be calculated from the multicolor photometry.
Karpov Sergey
Malkov Oleg
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