Spectral irradiance calibration in the infrared. IX. Calibrated stellar spectra using DIRBE radiometry.
Abstract (from CDS):
The absolute calibration of the COBE/DIRBE data in the range 1-25 µm is examined through the in-band fluxes of DIRBE's own set of point-source calibration objects. Using the values of DIRBE fluxes expected for Sirius and for 10 of our published set of absolutely calibrated K and M giants that are in common with DIRBE's own calibration network, I find consistency with the project's formal basis, namely, our published calibrated spectrum of Sirius. This consistency means that one can use the DIRBE radiometry to construct absolutely calibrated ``stellar templates'' (i.e., continuous calibrated spectra from 1 to 35 µm) on the assumption that the intrinsic stellar spectrum of a star of given spectral class matches the intrinsic spectrum for the star of the same spectral class among the set of K and M giants, the spectrum of which has been absolutely defined. This technique is validated using a set of early M giants with well-characterized ground-based photometry and confirmed with IRAS low-resolution spectra.