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10 papers
[O III]/[N II] as an Abundance Indicator at High Redshift
Max Pettini, Bernard E J Pagel
Among `empirical' methods of estimating oxygen abundances in extragalactic HII regions, the use of the ratio of nebular lines of [O III] and [N II], first introduced by Alloin et a…
Galactic archaeology: IMF and depletion in the "thin disk"
K. -P. Schröder, B. Pagel
We determine the initial mass function (IMF) of the ``thin disk'' by means of a direct comparison between synthetic stellar samples (for different matching choices of IMF, star for…
CNO Abundances in Dwarf and Spiral Galaxies
B. E. J. Pagel
CNO abundances in galaxies bear on issues of galactic evolution as well as stellar evolution and nucleosynthesis. Knowledge about them in dwarf and spiral galaxies depends mainly o…
Chemical Evolution of the Galaxy: the G-dwarf problem and radioactive chronology revisited taking account of the Thick Disk
B. E. J. Pagel
Thin and Thick disk metallicities overlap, but alpha(Fe) relations differ; there is also a hiatus in time before the first thin-disk stars, with a minimum metallicity [Fe/H] = -0.6…
s/alpha/Fe Abundance Ratios in Halo Field Stars: Is there a Globular Cluster Connection?
B. E. J. Pagel, G. Tautvaisiene
We try to understand the s- and r-process elements vs Ti/Fe plots derived by Jehin et al. (1999) for mildly metal-poor stars within the framework of the analytical semi-empirical m…
Early Chemical Evolution of Galaxies
B. E. J. Pagel
Initial conditions are set by Big bang nucleosynthesis from which we know that 90 per cent of baryons are dark and have essentially unknown chemical composition. In our own Galaxy,…