Boyer, ML, McQuinn, KBW, Barmby, P, Bonanos, AZ, Gehrz, RD, Gordon, KD, Groenewegen, MAT, Lagadec, E, Lennon, D, Marengo, M, Meixner, M, Skillman, E, Sloan, GC, Sonneborn, G, van Loon, JT and Zijlstra, A (2014) An infrared census of dust in nearby galaxies with Spitzer (Dustings). I. Overview. Astrophysical Journal Supplement Series, 216 (1). ISSN 0004-637X

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Nearby resolved dwarf galaxies provide excellent opportunities for studying the dust-producing late stages of stellar evolution over a wide range of metallicity (–2.7 lesssim [Fe/H] lesssim –1.0). Here, we describe DUSTiNGS (DUST in Nearby Galaxies with Spitzer): a 3.6 and 4.5 μm post-cryogen Spitzer Space Telescope imaging survey of 50 dwarf galaxies within 1.5 Mpc that is designed to identify dust-producing asymptotic giant branch (AGB) stars and massive stars. The survey includes 37 dwarf spheroidal, 8 dwarf irregular, and 5 transition-type galaxies. This near-complete sample allows for the building of statistics on these rare phases of stellar evolution over the full metallicity range. The photometry is >75% complete at the tip of the red giant branch for all targeted galaxies, with the exception of the crowded inner regions of IC 10, NGC 185, and NGC 147. This photometric depth ensures that the majority of the dust-producing stars, including the thermally pulsing AGB stars, are detected in each galaxy. The images map each galaxy to at least twice the half-light radius to ensure that the entire evolved star population is included and to facilitate the statistical subtraction of background and foreground contamination, which is severe at these wavelengths. In this overview, we describe the survey, the data products, and preliminary results. We show evidence for the presence of dust-producing AGB stars in eight of the targeted galaxies, with metallicities as low as [Fe/H] = –1.9, suggesting that dust production occurs even at low metallicity.

Item Type: Article
Additional Information: ©IOP Publishing, The American Astronomical Society
Uncontrolled Keywords: galaxies: dwarf, galaxies: photometry, galaxies: stellar content, infrared: stars, Local Group, stars: AGB and post-AGB, stars: mass-loss, stars: winds, outflows
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 14 Jul 2015 08:57
Last Modified: 15 May 2019 08:53

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