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http://hdl.handle.net/20.500.12386/34334
Titolo: | NGC1818 unveils the origin of the extended main-sequence turn-off in young Magellanic Clouds clusters | Autori: | CORDONI, Giacomo Milone, Antonino P. MARINO, Anna Cignoni, Michele Lagioia, Edoardo P. TAILO, Marco Carlos, Marília DONDOGLIO, Emanuele Jang, Sohee Mohandasan, Anjana Legnardi, Maria V. |
Data pubblicazione: | 2022 | Rivista: | NATURE COMMUNICATIONS | Numero: | 13 | Fascicolo: | 1 | Abstract: | The origin of young star clusters represents a major challenge for modern stellar astrophysics. While stellar rotation partially explains the colour spread observed along main-sequence turn-offs, i.e. where stars leave the main-sequence after the exhaustion of hydrogen in their core, and the multiple main sequences in the colour-magnitude diagrams of stellar systems younger than approximately 2 Gyr, it appears that an age difference may still be required to fulfill the observational constraints. Here we introduce an alternative approach that exploits the main-sequence turn-on, i.e. the point alongside the colour-magnitude diagram where pre-main-sequence stars join the main-sequence, to disentangle between the effects of stellar rotation and age to assess the presence, or lack thereof, of prolonged star formation in the approximately 40-Myr-old cluster NGC1818. Our results provide evidence for a fast star formation, confined within 8 Myr, thus excluding age differences as responsible for the extended main-sequence turn-offs, and leading the way to alternative observational perspectives in the exploration of stellar populations in young clusters. | URI: | http://hdl.handle.net/20.500.12386/34334 | URL: | https://www.nature.com/articles/s41467-022-31977-y | ISSN: | 2041-1723 | DOI: | 10.1038/s41467-022-31977-y | Fulltext: | open |
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