Barkha Yakub Bale
Abundances of chemical elements in magnetically active stars
This study investigates the influence of magnetic activity on the chemical composition and internal mixing processes in stars. Through a homogeneous high-resolution spectroscopic analysis of a sample comprising more than 50 magnetically active RS Canum Venaticorum (RS CVn) stars observed at Moletai Astronomical Observatory, Lithuania, complemented by a sample of eruptive stars observed at the Nordic Optical Telescope, we identify systematic deviations from the predictions of standard stellar evolution models.
The results show that in magnetically active stars, internal mixing processes can occur earlier than expected, as indicated by low carbon isotope ratios and unusual lithium abundances. These findings suggest that magnetic activity plays a key role in modifying the internal structure and evolution of stars. In contrast, the chemical abundances of eruptive stars remain consistent with predictions from standard stellar evolution, implying that their surface activity does not lead to significant modification of their chemical composition.
These findings demonstrate that magnetic activity plays a key role in altering the timing and efficiency of internal mixing in evolved stars, providing new insights into stellar evolution and chemical enrichment in the Galaxy.
