homogenized optical abundances
when they analyzed 14 special Classical Cepheids,
Technical definition
A set of metallicities derived from high-resolution optical spectroscopy, corrected for systematic uncertainties and converted to a common scale.
when they analyzed 14 special Classical Cepheids,
A set of metallicities derived from high-resolution optical spectroscopy, corrected for systematic uncertainties and converted to a common scale.