Detailed asteroseismic modeling of two Helmi stream red giants yields ages of 11.16 and 12.52 Gyr, indicating the stream's progenitor formed stars at least 12 Gyr ago and that global scaling relations underestimate such ages.
Astro2020 Science White Paper: Stellar Physics and Galactic Archeology using Asteroseismology in the 2020's
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abstract
Asteroseismology is the only observational tool in astronomy that can probe the interiors of stars, and is a benchmark method for deriving fundamental properties of stars and exoplanets. Over the coming decade, space-based and ground-based observations will provide a several order of magnitude increase of solar-like oscillators, as well as a dramatic increase in the number and quality of classical pulsator observations, providing unprecedented possibilities to study stellar physics and galactic stellar populations. In this white paper, we describe key science questions and necessary facilities to continue the asteroseismology revolution into the 2020's.
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Precise Asteroseismic Ages for the Helmi Streams
Detailed asteroseismic modeling of two Helmi stream red giants yields ages of 11.16 and 12.52 Gyr, indicating the stream's progenitor formed stars at least 12 Gyr ago and that global scaling relations underestimate such ages.