Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21540120b&link_type=abstract
American Astronomical Society, AAS Meeting #215, #401.20; Bulletin of the American Astronomical Society, Vol. 42, p.221
Astronomy and Astrophysics
Astronomy
Scientific paper
Hydrogen envelope white dwarf stars (DAs) have relatively simple spectra which can be analyzed to yield highly accurate values of Teff and log-g. These spectra also yield colors for any synthesized filter band passes which fall within the observation range. These properties make DAs ideal candidates for calibration of color zero points for the LSST. Comparison of the DA spectra taken by the Auxiliary (monitoring) Telescope with the exo-atmospheric spectral energy distribution allows detailed understanding of the effect of the atmosphere on the observations.
We present a strategy to develop DA white dwarfs as potential calibrators for the LSST. These stars will be used to establish and monitor the color zero points for the LSST photometric system and can be used to search for systematic errors in the color zero points over the area (ra, dec) of the survey. We include the observational strategy to have several hundred well characterized stars in place prior to the start of LSST operations and preliminary results from our early characterization observing efforts.
This work is supported by the National Science Foundation under Scientific Program Order No. 9 (AST-0551161) through Cooperative Agreement AST-0132798.
Burke David L.
Butner Melissa
LSST Calibration Team
Smith Jeffrey J.
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