Understanding Li enhancement in K giants and role of accurate parallaxes

Our recent studies based on a large sample of K giants with Hipparcos parallaxes and spectroscopic analysis resulted more than a dozen new Li-rich K giants including few super Li-rich ones. Most of the Li-rich K giants including the new ones appear to occur at the luminosity bump in the HR diagram....

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2017-04, Vol.12 (S330), p.348-349
Main Authors: singh, Raghubar, Reddy, B. E.
Format: Article
Language:English
Subjects:
Astronomy
Contributed Papers
Luminosity
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Summary:Our recent studies based on a large sample of K giants with Hipparcos parallaxes and spectroscopic analysis resulted more than a dozen new Li-rich K giants including few super Li-rich ones. Most of the Li-rich K giants including the new ones appear to occur at the luminosity bump in the HR diagram. However, one can’t rule out the possibility of overlap with the clump region where core He-burning K giants reside post He-flash at the tip of RGB. It is important to distinguish field K giants of clump from the bump region in the HR diagram to understand clues for Li production in K giants. In this poster, we explore whether GAIA parallaxes improve to disentangle clump from bump region, more precisely.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921317005804