Speaker
Frédéric Thévenin
(OCA)
Description
HD122563 is a metal-poor ([M/H] = -2.5) old Population II star. It is one of the few nearby metal-poor stars that can be studied in detail. Such a benchmark star is important for understanding the physics of stellar atmospheres in the not-so-solar metallicity regime, understanding oscillations and stellar interiors in the context of metallicities, and providing a reference point for calibrating large galactic spectroscopic surveys such as Gaia. This star has been well studied using spectroscopic, photometric, and interferometric data. Since just over a year, we have been obtaining radial velocity data from the ground-based SONG Hertzsprung telescope with typically one point per night. We see clear evidence of oscillations and initial analyses point towards the global seismic quantity, numax, in clear disagreement with that predicted from the known radius and mass. We present the current status of HD122563 and our initial asteroseismic results.
Primary author
Frédéric Thévenin
(OCA)
Co-author
Orlagh Creevey
(Observatoire de la Cote d'Azur)
