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Infrared light curves of dusty & metal-poor AGB stars

Published online by Cambridge University Press:  30 December 2019

Steven R. Goldman ,
Martha Boyer Open the ORCID record for Martha Boyer [Opens in a new window]  and
the DUSTiNGS team
Steven R. Goldman
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: s.goldman@stsci.edu
Martha Boyer
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: s.goldman@stsci.edu
the DUSTiNGS team
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: s.goldman@stsci.edu
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Abstract

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The effects of metallicity on both the dust production and mass loss of evolved stars have consequences for stellar masses, stellar lifetimes, progenitors of core-collapse SNe, and the origin of dust in the ISM. With the DUST in Nearby Galaxies with Spitzer (DUSTiNGS) survey, we have discovered samples of dusty evolved AGB stars out to the edge of the Local Group with metallicities down to 0.6% solar. This makes them the nearest analogs of AGB stars in high-redshift galaxies. We present new infrared light curves of the dustiest AGB stars in 10 galaxies from the DUSTiNGS survey and show how the infrared Period-Luminosity (PL) relation is affected by dust and metallicity. These results have implications for the efficiency of AGB dust production at high-redshift and for the use of the Mira PL relation as a distance indicator.

Keywords

stars: AGB and post-AGBstars: variables: othergalaxies: dwarf(galaxies:) Local Groupstars: carboninfrared: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 406 - 408
Copyright
© International Astronomical Union 2019 

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