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| Paper: |
The Gaia-ESO Survey: CNO Abundances in Open Clusters of our Galaxy\thanks |
| Volume: |
507, Multi-Object Spectroscopy in the Next Decade: Big Questions, Large Surveys, and Wide Fields |
| Page: |
197 |
| Authors: |
Drazdauskas, A.; Tautvaišienė, G.; Mikolaitis, Š.; Barisevičius, G.; Puzeras, E.; Stonkutė, E.; Chorniy, Y.; GES collaborators |
| Abstract: |
We present the current status of CNO abundance investigations in evolved stars of Galactic open clusters observed in the currently ongoing Gaia-ESO survey.
The spectra were observed with the VLT UVES spectrograph and analysed using a differential model atmosphere method.
The C/N ratios of stars in the investigated open clusters were compared with the ratios predicted by stellar
evolutionary models. For the corresponding stellar turn-off masses from 1.15 to 3.3 M☉, the observed
C/N ratio values are close to the predictions of standard first dredge-up and thermohaline extra-mixing models.
The recent model in which the thermohaline- and rotation-induced extra-mixing act together seems to provide C/N values that are too low. |
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