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An atlas of selected calibrated stellar spectraFive hundred and fifty six stars in the IRAS PSC-2 that are suitable for stellar radiometric standards and are brighter than 1 Jy at 25 microns were identified. In addition, 123 stars that meet all of our criteria for calibration standards, but which lack a luminosity class were identified. An approach to absolute stellar calibration of broadband infrared filters based upon new models of Vega and Sirius due to Kurucz (1992) is presented. A general technique used to assemble continuous wide-band calibrated infrared spectra is described and an absolutely calibrated 1-35 micron spectrum of alpha(Tau) is constructed and the method using new and carefully designed observations is independently validated. The absolute calibration of the IRAS Low Resolution Spectrometer (LRS) database is investigated by comparing the observed spectrum of alpha(Tau) with that assumed in the original LRS calibration scheme. Neglect of the SiO fundamental band in alpha(Tau) has led to the presence of a specious 'emission' feature in all LRS spectra near 8.5 microns, and to an incorrect spectral slope between 8 and 12 microns. Finally, some of the properties of asteroids that effect their utility as calibration objects for the middle and far infrared region are examined. A technique to determine, from IRAS multiwaveband observations, the basic physical parameters needed by various asteroid thermal models that minimize the number of assumptions required is developed.
Document ID
19930015946
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Walker, Russell G. (Jamieson Science and Engineering, Inc. Scotts Valley, CA, United States)
Cohen, Martin (Jamieson Science and Engineering, Inc. Scotts Valley, CA, United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1992
Subject Category
Astronomy
Report/Patent Number
NASA-CR-177604
NAS 1.26:177604
A-93022
Accession Number
93N25135
Funding Number(s)
PROJECT: RTOP 188-41-53
CONTRACT_GRANT: NAS2-13327
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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