Lithium Processing in Halo Dwarfs, and T eff, Fe/H Correlations on the Spite Plateau

view Abstract Citations (106) References (55) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Lithium Processing in Halo Dwarfs, and T eff, Fe/H Correlations on the Spite Plateau Ryan, Sean G. ; Beers, Timothy C. ; Deliyannis, Constantine P. ; Thorburn, Julie A. Abstract We present new Li data for seven halo turnoff stars chosen to test for diffusion. These are combined with data from the literature, and new effective temperatures and Li abundances are computed for the entire set on uniform temperature and abundance scales. We conclude that the effects expected of diffusion are not obvious in warm halo dwarfs, and uninhibited diffusion is unlikely to result in an initial Li abundance more than 0.1 dex higher than that inferred from nondiffusive models. (Other mechanisms for depleting Li, possibly by substantially larger amounts, are still possible.) We consider the ongoing debate concerning the existence of correlations between the Li abundances for metal-poor stars and Teff and overall metallicity, Fe/H. Molaro, Primas, the contrast between G64 -12, G64 -37, and CD -33° 1173 provides the best example. However, we defer our main discussion on a possible intrinsic spread in the Spite plateau to a separate paper. Subject headings: diffusion Galaxy: halo stars: abundances Publication: The Astrophysical Journal Pub Date: February 1996 DOI: 10.1086/176838 Bibcode: 1996ApJ...458..543R Keywords: DIFFUSION; GALAXY: HALO; STARS: ABUNDANCES full text sources ADS | data products SIMBAD (104)