Speaker
Description
Chemical abundances of globular clusters (GCs) are a powerful tool to investigate the history of their and their host galaxy’s formation. These can be measured with integrated-light (IL) spectroscopy with a precision of 0.01 dex. However, the abundances of Mg in the spectra of the Milky Way (MW) and extragalactic GCs show deviation compared to the abundances of alpha-elements. These anomalies are linked to internal abundance spreads in GCs and pose challenges for IL analysis. We observed the MW globular cluster NGC2419, known to have extreme Mg abundance variations, with the recently deployed WEAVE Large Integral Field Unit with spectral resolution of R ~ 10 000. WEAVE is a multi-object fiber spectrograph installed on the William Herschel Telescope, and it can simultaneously obtain up to a thousand spectra. We derived the Mg abundances from the IL spectrum and from individual stars using 3D spectroscopy, and compared the results.
