NIST-traceable SI Calibration of Standard Stars

Details NIST-traceable SI Calibration of Standard Stars NIST-traceable SI Calibration of Standard Stars

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715715m&link_type=abstract

American Astronomical Society, AAS Meeting #217, #157.15; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astrophysics

Scientific paper

We describe optical spectrophotometric observing techniques for bright stars, and two independent procedures for calibrating these observations to NIST-calibrated detectors, resulting in absolute spectral energy distributions in SI irradiance units of W/m2/nm.
Stars, thermal point sources with physically well understood structures and atmospheres, radiate from the ultraviolet to the infrared and thus provide excellent radiometric standards against which to compare and calibrate ground- and space-based astronomical observations. We have evolved techniques for ground-based standardization of the spectral energy distributions of stars from 350 nm to 1050 nm for an initial set of standard stars with V < 5.5.
With adequate photometric and spectrophotometric vetting, stable standard star candidates can be identified. The Measurement Astrophysics (MAP) standardization technique uses a unique objective spectrometer supported by an atmospheric extinction-sensing lidar for the stellar observations. The spectrometer is calibrated using two separate NIST detector-based standardization techniques. The first is implemented by observing a far-field, point-like NIST spectrophotometrically monitored source approximately one kilometer distant, and the second uses a near-field collimated source illuminated wavelength-by-wavelength using a monochrometer. We describe in detail the calibration procedures and analyze the utility of calibrating astronomical standard stars using two independent procedures.
MAP standard star research is supported by NIST Award 60NANB9D9121 and NSF Grant AST-1009878.

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