Journal
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume 216, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0067-0049/216/1/10
Keywords
galaxies: dwarf; galaxies: photometry; galaxies: stellar content; infrared: stars; Local Group; stars: AGB and post-AGB; stars: mass-loss; stars: winds, outflows
Categories
Funding
- Spitzer [GO80063]
- NASA Astrophysics Data Analysis Program [N3-ADAP13-0058]
- NASA Postdoctoral Program at the Goddard Space Flight Center through a contract with NASA
- NASA
- United States Air Force
- European Union (European Social Fund)
- National Resources under the ARISTEIA action of the Operational Programme Education and Lifelong Learning in Greece
- NSF [AST-1108645]
- STFC [ST/L000768/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L000768/1] Funding Source: researchfish
Ask authors/readers for more resources
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 less than or similar to [Fe/H] less than or similar to -1.0). Here, we describe DUSTiNGS (DUST in Nearby Galaxies with Spitzer): a 3.6 and 4.5 mu m 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.
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