Overview: This tool allows input of a K-band magnitude (CIT,
UKIRT or 2MASS systems -- for 2MASS the waveband is actually K-short
rather than K) or flux density for stellar point sources. A flux
density estimate in the IRAC wavebands and the wavebands of IRS short
and long modules, plus the MIPS Si:As 24 micron array is obtained (no
color correction is applied). Flux density estimates are based on
Kurucz-Lejeune atmospheric models for MK class I, III and V stars
(kindly provided by Dr. Sergio Fajardo-Acosta of the Spitzer Science
Center).
USE OF THE FLUX DENSITY ESTIMATOR: Use the pull down menus under
Photometric System, Spectral Type and MK class to indicate which
magnitude system is being used, and the spectral type of the star under
consideration. Entry of a magnitude -- under the heading "K-band
magnitude" -- provides a conversion to K-band flux density (or enter a
flux density to get K-band magnitude), plus an estimate in mJy of the
flux density at the four IRAC wavelengths (3.6, 4.5, 5.8 and 8 microns),
plus 15 microns (IRS peakup and short wavelength module), and 24 microns
(IRS long wavelength module and MIPS Si:As array). K-band flux densities
can be entered in a number of units -- use the pull-down menu under
"K-band flux density" to find the units you want.
Note: for giant and supergiant stars a more limited set of
spectral types are available:
Available spectral types for MK class
I: O5, O6, O8, B0, B5, A0, A5, F0, F5, G0, G5, K0, K5, M0 and M2.
Available spectral types for MK class III: O5, O6, O8, B0, B5,
G0, G5, K0, K5 and M0.