Sun-like Oscillations in the Population II giant HD 122563

TL;DR

This study detects and analyzes Sun-like oscillations in the metal-poor Population II giant HD 122563, deriving precise stellar parameters through seismic data and Gaia parallax, advancing understanding of such stars.

Contribution

First detection of Sun-like oscillations in HD 122563, providing new precise stellar parameters using seismic data combined with Gaia measurements.

Findings

Detected global seismic quantity numax in HD 122563

Derived new precise surface gravity, radius, and distance

Results consistent with Gaia DR2 parallax

Abstract

We have been monitoring the metal-poor Population II giant, HD 122563, for radial velocity variations since 2016 using the SONG telescope on Tenerife. We have detected the global seismic quantity, numax, which provides information related to the stellar parameters. By combining these data with complementary data, we derive a new precise surface gravity, radius and distance to the star. Our results are corroborated by using the parallax from Gaia DR2. We present these results and some of their implications.