Inferring the Helium abundance of extragalactic Globular Clusters using Integrated Spectra

The leading method for the determination of relevant stellar population parameters of unresolved extragalactic Globular Clusters is through the study of their integrated spectroscopy, where Balmer line-strength indices are considered to be age sensitive. Previously, a splitting in the highly optimised spectral line-strength index H\beta_o was observed in a sample... Show more