Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...199..269h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 199, no. 1-2, June 1988, p. 269-290.
Astronomy and Astrophysics
Astrophysics
56
Galactic Evolution, Nuclear Astrophysics, Subdwarf Stars, Abundance, Chemical Evolution, Metallicity
Scientific paper
Observations of more than 20 metal-poor subdwarfs are presented, discussing the spectroscopic abundance analyses based on high-reolution spectra and scaled solar model atmospheres. Many of the stars are shown to be more evolved than can be reconciled with reasonable time scales based on standard theory of stellar evolution, suggesting that the post main sequence evolution of cool metal-poor stars is influenced by an enhanced O/Fe ratio compared with a standard solar mixture. Radial velocities are given for 60 metal-poor stars, 25 percent of which are suspected to be velocity variable. The kinematic properties of several specific stars are discussed. The abundance ratios Mg/Fe, Ca/Fe, Ti/Fe, Al/Fe, and Mn/Fe as a function of the Fe abundance itself indicate that these elements probably have not been produced in purely explosive nucleosynthesis. It is suggested that a considerable fraction of the isotopes must have been synthesized during preceding hydrostatic burning phases.
Gehren Thomas
Hartmann K.
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