Traveling back in time: Asteroseismology of low-metallicity red giants from TESS
Year: 2024
Type: article
Abstract: Galactic archaeology has long been limited by a lack of precise masses and ages for metal-poor stars in the Milky Way's thick disk. However, with TESS providing a growing number of photometric observations, it is possible to calculate such physical properties for more solar-like oscillators than ever using asteroseismology. We have used the pySYD pipeline to determine global asteroseismic parameters and calculated the masses and ages of 415 metal-poor ([M/H] < -0.5 dex) red giants in TESS's continuous viewing zones. Our findings contribute to a noticeable trend in metallicity-dependent mass loss on the upper red-giant branch and identify a set of young high-⍺ stars that have been detected in other studies. We also find that 15% of the metal-poor stars appear to be binary merger products. In combination with existing ages from Kepler/K2, these data can be compared to Galactic evolution models to better determine the formation history of the Galaxy.
Authors: Marasco, Corin, Tayar, Jamie
Institution: University of Florida
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6968025227
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