Li in carbon-enhanced metal-poor stars

Thomas Masseron, J. Johnson, Sara Lucatello, A. Karakas, B Plez, Timothy C Beers, Norbert Christlieb

Research output: Contribution to journalArticleResearch

Abstract

Carbon-enhanced metal-poor (CEMP) stars are believed to show the respective chemical imprints of more massive stars (M> 0.8M) that are now extinct. In particular, it is expected that the observed abundance of Li should deviate in these stars from the standard Spite lithium plateau.We study here a sample of 11 metal-poor stars and a doublelined spectroscopic binary with -1.8 < [Fe/H] < -3.3 observed with VLT/UVES spectrograph. Among these 12 metal-poor stars, there are 8 CEMP stars for which we measure or constrain the Li abundance. In contrast to previous arguments, we demonstrate that an appropriate regime of dilution permits the existence of "Li-Spite plateau and C-rich" stars, whereas some of the "Li-depleted and C-rich" stars call for an unidentified additional depletion mechanism that cannot be explained by dilution alone. We found some evidence that rotation is related to depletion in some CEMP stars.

Original languageEnglish
Pages (from-to)117-120
Number of pages4
JournalJournal of the Italian Astronomical Society, Supplement
Volume22
Publication statusPublished - 2012
Externally publishedYes

Keywords

  • Abundances
  • Carbon-rich stars
  • Metal-poor stars

Cite this