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We present Spitzer Space Telescope IRAC photometry of the Local Group dwarfirregular galaxy IC 1613. We compare our 3.6, 4.5, 5.8, and 8.0 micronphotometry with broadband optical photometry and find that the optical data donot detect 43% and misidentify an additional 11% of the total AGB population,likely because of extinction caused by circumstellar material. Further, we findthat a narrowband optical carbon star study of IC 1613 detects 50% of the totalAGB population and only considers 18% of this population in calculating thecarbon to M-type AGB ratio. We derive an integrated mass-loss rate from the AGBstars of 0.2-1.0 x 10^(-3) solar masses per year and find that the distributionof bolometric luminosities and mass-loss rates are consistent with those forother nearby metal-poor galaxies. Both the optical completeness fractions andmass-loss rates in IC 1613 are very similar to those in the Local Group dwarfirregular, WLM, which is expected given their similar characteristics andevolutionary histories.

A Spitzer IRAC Census of the Asymptotic Giant Branch Populations in Local Group Dwarfs. II. IC 1613