The elderly among the oldest: new evidence for extremely metal-poor RR
Lyrae stars
The elderly among the oldest: new evidence for extremely metal-poor RR
Lyrae stars
We performed a detailed spectroscopic analysis of three extremely metal-poor RR Lyrae stars, exploring uncharted territories at these low metallicities for this class of stars. Using high-resolution spectra acquired with HARPS-N at TNG, UVES at VLT, and PEPSI at LBT, and employing Non-Local Thermodynamic Equilibrium (NLTE) spectral synthesis calculations, we …