English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Abundances of lithium, carbon, and oxygen have been derived using spectralsynthesis for a sample of 249 bright F, G, and K Northern Hemisphere dwarfstars from the high-resolution spectra acquired with the VUES spectrograph atthe Moletai Astronomical Observatory of Vilnius University. The sample starshave metallicities, effective temperatures, and ages between -0.7 and 0.4 dex;5000 and 6900 K; 1 and 12 Gyr, accordingly. We confirm a so far unexplainedlithium abundance decrease at supersolar metallicities - $A$(Li) in our samplestars, which drop by 0.7 dex in the [Fe/H] range from +0.10 to +0.55 dex.Furthermore, we identified stars with similar ages, atmospheric parameters, androtational velocities, but with significantly different lithium abundances,which suggests that additional specific evolutionary factors should be takeninto account while interpreting the stellar lithium content. Nine stars withpredominantly supersolar metallicities, i.e. about 12 % among 78 stars with Cand O abundances determined, have the C/O number ratios larger than 0.65, thusmay form carbon-rich rocky planets. Ten planet-hosting stars, available in oursample, do not show a discernible difference from the stars with no planetsdetected regarding their lithium content.

High-resolution Spectroscopic Study of Dwarf Stars in the Northern Sky: Lithium, Carbon, and Oxygen Abundances