A Spitzer/IRAC Census of the Asymptotic Giant Branch Populations in Local Group Dwarfs

Details A Spitzer/IRAC Census of the Asymptotic Giant Branch Populations in Local Group Dwarfs A Spitzer/IRAC Census of the Asymptotic Giant Branch Populations in Local Group Dwarfs

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916709j&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #167.09; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a Spitzer/IRAC near-IR imaging census of the AGB stars in the three Local Group dwarf irregular galaxies IC 1613, WLM, and Sextans A. By combining our IR data with optical imaging of these galaxies we find that 39-55% of the AGB stars detected in the IR are not detected in the optical and an additional 4-11% of the AGB stars are misidentified as sub-TRGB red giants in the optical, presumably due to extinction by circumstellar dust. We compare our IR photometry of IC 1613 and WLM with narrow-band optical data and find that only 18-19% of the AGB stars detected in the IR are seen in these studies. We detect a number of sources in each galaxy that have IR fluxes consistent with them being mass-losing AGB stars, and derive total present day mass-loss rates of 2-4 x 10^-4 solar masses per year. In all three galaxies the distribution of mass-loss rates and bolometric luminosities of AGB stars, as well as the empirical maximum mass-loss rates are in excellent agreement with those found in the LMC and SMC.
This work is supported by NASA JPL/SSC-1256406, 1215746).

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