Wako Aoki et al. 2009 ApJ 698 1803 doi:10.1088/0004-637X/698/2/1803
LITHIUM ABUNDANCES OF EXTREMELY METAL-POOR TURNOFF STARS*
FREE ISSUEWako Aoki1,2, Paul S. Barklem3, Timothy C. Beers4, Norbert Christlieb5, Susumu Inoue1,9, Ana E. García Pérez6, John E. Norris7 and Daniela Carollo7,8
Show affiliationsWe have determined Li abundances for eleven metal-poor turnoff stars, among which eight have [Fe/H] <–3, based on LTE analyses of high-resolution spectra obtained with the High Dispersion Spectrograph on the Subaru Telescope. The Li abundances for four of these eight stars are determined for the first time by this study. Effective temperatures are determined by a profile analysis of Hα and Hβ. While seven stars have Li abundances as high as the Spite Plateau value, the remaining four objects with [Fe/H] <–3 have A(Li) =log (Li/H)+ 12 
2.0, confirming the existence of extremely metal-poor (EMP) turnoff stars having low Li abundances, as reported by previous work. The average of the Li abundances for stars with [Fe/H]<–3 is lower by 0.2 dex than that of the stars with higher metallicity. No clear constraint on the metallicity dependence or scatter of the Li abundances is derived from our measurements for the stars with [Fe/H]<–3. Correlations of the Li abundance with effective temperatures, with abundances of Na, Mg, and Sr, and with the kinematical properties are investigated, but no clear correlation is seen in the EMP star sample.
- Footnote
- Keywords
nuclear reactions, nucleosynthesis, abundances; stars: abundances; stars: Population II
- Dates
-
Issue 2 (2009 June 20)
Received 2008 November 26, accepted for publication 2009 April 13
Published 2009 June 4
-
Lithium Abundances of Extremely Metal-Poor Turnoff Stars
Wako Aoki et al. 2009 ApJ 698 1803
-
Control of a brain–computer interface without spike sorting
George W Fraser et al 2009 J. Neural Eng. 6 055004
-
Chandra Observations of the Northeastern Rim of the Cygnus Loop
Satoru Katsuda et al. 2008 ApJ 680 1198
-
Speckle Interferometry at the US Naval Observatory. VI.
Brian D. Mason et al. 2000 The Astronomical Journal 120 1120
-
LDA + Gutzwiller method for correlated electron systems
XiaoYu Deng et al 2008 EPL 83 37008
-
An initial analysis of options for a UK feed-in tariff for photovoltaic energy, from an array owner's viewpoint
Steve Plater 2009 Environ. Res. Lett. 4 044004
-
The Sloan Lens ACS Survey. IX. Colors, Lensing, and Stellar Masses of Early-Type Galaxies
M. W. Auger et al. 2009 ApJ 705 1099
-
The Runts of the Litter: Why Planets Formed Through Gravitational Instability Can Only Be Failed Binary Stars
Kaitlin M. Kratter et al. 2010 ApJ 710 1375
-
Radiative Hydrodynamic Simulations of HD209458b: Temporal Variability
Ian Dobbs-Dixon et al. 2010 ApJ 710 1395
-
Record Russian river discharge in 2007 and the limits of analysis
A I Shiklomanov and R B Lammers 2009 Environ. Res. Lett. 4 045015