English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The presence of multiple populations (MPs) with distinctive light elementabundances is a widespread phenomenon in clusters older than 6 Gyr. Clusterswith masses, luminosities, and sizes comparable to those of ancient globularsare still forming today. Nonetheless, the presence of light element variationshas been poorly investigated in such young systems, even if the knowledge ofthe age at which this phenomenon develops is crucial for theoretical models onMPs. We use J-band integrated spectra of three young (7-40 Myr) clusters in NGC4038 to look for Al variations indicative of MPs. Assuming that the largemajority (>70%) of stars are characterised by high Al content - as observed inGalactic clusters with comparable mass; we find that none of the studiedclusters show significant Al variations. Small Al spreads have been measured inall the six young clusters observed in the near-infrared. While it is unlikelythat young clusters only show low Al whereas old ones display different levelsof Al variations; this suggests the possibility that MPs are not present atsuch young ages at least among the high-mass stellar component. Alternatively,the fraction of stars with field-like chemistry could be extremely large,mimicking low Al abundances in the integrated spectrum. Finally, since thenear-infrared stellar continuum of young clusters is almost entirely due toluminous red supergiants, we can also speculate that MPs only manifestthemselves in low mass stars due to some evolutionary mechanism.

Searching for GC-like abundance patterns in young massive clusters II. - Results from the Antennae galaxies