Goldman, SR, Boyer, ML, McQuinn, KBW, Whitelock, PA, McDonald, I, van Loon, JT ORCID: https://orcid.org/0000-0002-1272-3017, Skillman, ED, Gehrz, RD, Javadi, A, Sloan, GC, Jones, OC, Groenewegen, MAT and Menzies, JW (2019) An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS). V. The Period-Luminosity Relation for Dusty Metal-poor AGB Stars. Astrophysical Journal, 877 (1).

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Abstract

The survey for DUST in Nearby Galaxies with Spitzer (DUSTiNGS) has identified hundreds of candidate dust-producing asymptotic giant branch (AGB) stars in several nearby metal-poor galaxies. We have obtained multi-epoch follow-up observations for these candidates with the Spitzer Space Telescope and measured their infrared (IR) light curves. This has allowed us to confirm their AGB nature and investigate pulsation behavior at very low metallicity. We have obtained high-confidence pulsation periods for 88 sources in seven galaxies. We have confirmed DUSTiNGS variable star candidates with a 20% success rate and determined the pulsation properties of 19 sources already identified as thermally pulsing AGB stars. We find that the AGB pulsation properties are similar in all galaxies surveyed here, with no discernible difference between the DUSTiNGS galaxies (down to 1.4% solar metallicity; [Fe/H] = −1.85) and the far more metal-rich Magellanic Clouds (up to 50% solar metallicity; [Fe/H] = −0.38). These results strengthen the link between dust production and pulsation in AGB stars and establish the IR period–luminosity relation as a reliable tool (±4%) for determining distances to galaxies, regardless of metallicity.

Item Type: Article
Additional Information: This is the final published version of the article (version of record). It first appeared online via IOP Science at https://doi.org/10.3847/1538-4357/ab0965 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: galaxies, dwarf, stellar content, infrared, stars, Local Group, AGB and post-AGB, carbon
Subjects: Q Science > QB Astronomy > QB799 Stars
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 17 Jun 2019 09:43
Last Modified: 17 Jun 2019 09:44
URI: http://eprints.keele.ac.uk/id/eprint/6494

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