Creating NIST-traceable Spectrophotometric Standard Stars

Details Creating NIST-traceable Spectrophotometric Standard Stars Creating NIST-traceable Spectrophotometric Standard Stars

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21544118m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #441.18; Bulletin of the American Astronomical Society, Vol. 42, p.403

Astronomy and Astrophysics

Astrophysics

Scientific paper

Though spectrophotometric standard stars enable or support thousands of astrophysical observations:
1. Fundamental calibration of stars to international standards has not been done since 1975
2. The astronomical community's fundamental standard star, Vega, is unique in that it has a debris disk and is rotating pole-on at near breakup velocity making it anything but a single-temperature, uniform surface brightness source
3. NIST has created spectrophotometric standard sources and detectors that provide sub-1% relative uncertainties allowing throughput calibration from 400nm - 1100nm
4. We have built an objective spectrometer to make standardized observations and a "clear air” lidar capable of providing sub-1% extinction measurements to correct for atmospheric extinction, the most significant systematic error in standardization.
These new capabilities for directly measuring and correcting for atmospheric transmission and calibrating telescope throughput enable creation of a new generation of fundamentally calibrated standard stars. The astronomical community will certainly benefit from a new network of fundamental spectrophotometric standard stars calibrated to NIST irradiance standards. We describe the techniques and technologies required to compare optical stellar spectra to NIST calibrated detectors, and the atmospheric measurements required to correct accurately for atmospheric extinction. We discuss observations of candidate standards with V ≤ 5.5 selected from an input catalog of approximately 500 northern hemisphere stars.
This project is supported by NIST Grant 60NANB9D9121 and AFRL Grant FA9451-08-C-0267.

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