Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115.2092c&link_type=abstract
The Astronomical Journal, Volume 115, Issue 5, pp. 2092-2096.
Astronomy and Astrophysics
Astronomy
20
Infrared Radiation, Methods: Miscellaneous, Stars: Late-Type
Scientific paper
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.
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