Lithium Abundance of Halo Stars With New Teff
نویسندگان
چکیده
منابع مشابه
Lithium Abundance of Halo Dwarfs Revised
Lithium abundances in a sample of halo dwarfs have been redetermined by using the new Teff derived by Fuhrmann et al (1994) from modelling of the Balmer lines. These Teff are reddening independent, homogeneous and of higher quality than those based on broad band photometry. Abundances have been derived by generating new atmospheric models by using the ATLAS-9 code by Kurucz (1993) with enhanced...
متن کاملThe Lithium Content of the Galactic Halo Stars
Thanks to the accurate determination of the baryon density of the universe by the recent cosmic microwave background experiments, updated predictions of the standard model of Big Bang nucleosynthesis now yield the initial abundance of the primordial light elements with an unprecedented precision. In the case of Li, the CMB+SBBN value is significantly higher than the generally reported abundance...
متن کاملr-Process Abundance Signatures in Metal-Poor Halo Stars
Abundance observations indicate the presence of rapid-neutron capture (i.e., r-process) elements in old Galactic halo and globular cluster stars. Recent observations of the r-process-enriched star BD+17◦3248 include new abundance determinations for the neutron-capture elements Cd I (Z=48), Lu II (Z = 71) and Os II (Z = 76), the first detections of these elements in metal-poor r-process-enriched...
متن کاملLithium Isotopic Abundances in Metal-poor Halo Stars
Very high-quality spectra of 24 metal-poor halo dwarfs and subgiants have been acquired with ESO’s VLT/UVES for the purpose of determining Li isotopic abundances. The derived 1D, nonLTE Li abundances from the Li i 670.8 nm line reveal a pronounced dependence on metallicity but with negligible scatter around this trend. Very good agreement is found between the abundances from the Li i 670.8 nm l...
متن کاملOn the lithium abundance dispersion in late-type Pleiades stars
I present the results of a programme to monitor the strengths of the Li I 6708Å, K I 7699Å and chromospheric Hα lines in a group of cool Pleiades stars. Consistent instrumentation and analysis techniques are used to show that there is no Li I variability on timescales of 1 year that could possibly account for the apparent spread in Li abundances seen in Pleiades stars between effective temperat...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 1995
ISSN: 1539-2996
DOI: 10.1017/s1539299600011655