000002116 001__ 2116
000002116 005__ 20160701171659.0
000002116 0247_ $$2DOI$$a10.1088/0004-637X/800/1/51
000002116 037__ $$aASTROimport-273
000002116 100__ $$aBoyer, M. L.
000002116 245__ $$aAn Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS). II. Discovery of Metal-poor Dusty AGB Stars
000002116 260__ $$c2015
000002116 520__ $$aThe DUSTiNGS survey (DUST in Nearby Galaxies with Spitzer) is a 3.6 and 4.5 µm imaging survey of 50 nearby dwarf galaxies designed to identify dust-producing asymptotic giant branch (AGB) stars and massive stars. Using two epochs, spaced approximately six months apart, we identify a total of 526 dusty variable AGB stars (sometimes called "extreme" or x-AGB stars; [3.6]-[4.5] > 0.1 mag). Of these, 111 are in galaxies with [Fe/H]  -1.5 and 12 are in galaxies with [Fe/H]  -2.0, making them the most metal-poor dust-producing AGB stars known. We compare these identifications to those in the literature and find that most are newly discovered large-amplitude variables, with the exception of ˜30 stars in NGC 185 and NGC 147, 1 star in IC 1613, and 1 star in Phoenix. The chemical abundances of the x-AGB variables are unknown, but the low metallicities suggest that they are more likely to be carbon-rich than oxygen-rich and comparisons with existing optical and near-IR photometry confirm that 70 of the x-AGB variables are confirmed or likely carbon stars. We see an increase in the pulsation amplitude with increased dust production, supporting previous studies suggesting that dust production and pulsation are linked. We find no strong evidence linking dust production with metallicity, indicating that dust can form in very metal-poor environments. 
000002116 700__ $$a McQuinn, K. B. W.
000002116 700__ $$a Barmby, P.
000002116 700__ $$a Bonanos, A. Z.
000002116 700__ $$a Gehrz, R. D.
000002116 700__ $$a Gordon, K. D.
000002116 700__ $$a Groenewegen, M. A. T.
000002116 700__ $$a Lagadec, E.
000002116 700__ $$a Lennon, D.
000002116 700__ $$a Marengo, M.
000002116 700__ $$a McDonald, I.
000002116 700__ $$a Meixner, M.
000002116 700__ $$a Skillman, E.
000002116 700__ $$a Sloan, G. C.
000002116 700__ $$a Sonneborn, G.
000002116 700__ $$a van Loon, J. T.
000002116 700__ $$a Zijlstra, A.
000002116 773__ $$c51$$i1$$pThe Astrophysical Journal$$v800$$y2015
000002116 85642 $$ahttp://esoads.eso.org/abs/2015ApJ...800...51B
000002116 905__ $$apublished in
000002116 980__ $$aREFERD