An absolute photometric system at 10 and 20 microns

Details An absolute photometric system at 10 and 20 microns An absolute photometric system at 10 and 20 microns

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90..900r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, May 1985, p. 900-906. NASA-NSF-USAF-supported research.

Astronomy and Astrophysics

Astronomy

91

A Stars, Astronomical Photometry, Calibrating, Infrared Spectroscopy, Stellar Spectrophotometry, Atmospheric Models, Error Analysis, Extrapolation, Radiant Flux Density, Spectral Sensitivity, Stellar Atmospheres

Scientific paper

Two new direct calibrations at 10 and 20 microns are presented in which terrestrial flux standards are referred to infrared standard stars. These measurements give both good agreement and higher accuracy when compared with previous direct calibrations. As a result, the absolute calibrations at 10 and 20 microns have now been determined with accuracies of 3 and 8 percent, respectively. A variety of absolute calibrations based on extrapolation of stellar spectra from the visible to 10 microns are reviewed. Current atmospheric models of A-type stars underestimate their fluxes by about 10 percent at 10 microns, whereas models of solar-type stars agree well with the direct calibrations. The calibration at 20 microns can probably be determined to about 5 percent by extrapolation from the more accurate result at 10 microns. The photometric system at 10 and 20 microns is updated to reflect the new absolute calibration, to base its zero point directly on the colors of A0 stars, and to improve the accuracy in the comparison of the standard stars.

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