Abundances of CNO in candidate young metal-poor stars

Alessio Mucciarelli (UNIBo); Elisabetta Caffau (LIRA); Linda Lombardo (OAT); Lorenzo Monaco (UNAB); Luca Sbordone (ESO); Monique Spite (LIRA); Patrick Francois (LIRA; Piercarlo Bonifacio (LIRA); Rosine Lallement (LIRA); UPJV)

arxiv: 2606.20200 · v1 · pith:2QBTT4YNnew · submitted 2026-06-18 · 🌌 astro-ph.GA

Abundances of CNO in candidate young metal-poor stars

Piercarlo Bonifacio (LIRA) , Elisabetta Caffau (LIRA) , Luca Sbordone (ESO) , Lorenzo Monaco (UNAB) , Linda Lombardo (OAT) , Rosine Lallement (LIRA) , Monique Spite (LIRA) , Patrick Francois (LIRA

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UPJV) Alessio Mucciarelli (UNIBO)

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keywords starsmassyoungabundancesaccretedaccretinganotherapparently

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In this contribution we investigate the CNO abundances in five apparently young evolved stars, with the aim of discriminating between truly young stars and stars that were rejuvenated by accreting mass from another star. Stars that have accreted mass are expected to show low C and O and a very low [C/O] ratio, as displayed by some stars in the Globular Cluster 47 Tuc, that are believed to have undergone mass-transfer. In our sample the low [C/O] ratios observed appear to be compatible with their evolutionary status. There is thus no indication for these stars having accreted mass.__

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Abundances of CNO in candidate young metal-poor stars

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