The (Al/Mg) ratio in halo stars of the field

Details The (Al/Mg) ratio in halo stars of the field The (Al/Mg) ratio in halo stars of the field

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..560l&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, June 1985, p. 560-569. Research supported by the Un

Astronomy and Astrophysics

Astronomy

5

Abundance, Aluminum, Horizontal Branch Stars, Magnesium, Metallicity, Stellar Composition, Astronomical Catalogs, Atmospheric Models, Barium, Spectral Line Width

Scientific paper

Newly determined magnesium and barium abundances for the halo horizontal-branch stars HD 2857 and HD 60778 are reported. Effects in model atmospheres which might explain the inconsistency between (Al/Mg) values for dwarfs and those for giants are considered. None of the presently recognized uncertainties is capable of resolving the problem. Two groups of stars with different aluminum-barium relations may exist. For stars with high aluminum abundances, aluminum and barium may have been formed in thermally-pulsing stars of mass about 7 solar mass or aluminum in 500 solar mass zero-metallicity objects. For stars with low aluminum abundances, aluminum and barium most likely originated explosively in stars of mass 10-30 solar mass.

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