Chemical compositions of semi-regular variable red giants
arxiv(2024)
摘要
A sample of warm low level semi-regular variables chosen from the General
Catalogue of Variable Stars is studied for their chemical compositions by
analysing high resolution optical spectra. The abundance ratios from Na/Fe to
Eu/Fe displayed by these and previously analysed semi-regular variables are
quite similar to ratios displayed by normal red giants across the Galactic thin
and thick disks and halo populations in the solar neighbourhood suggesting from
this perspective that the variables may be among the more photometrically
active red giants.
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