Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...418..812p&link_type=abstract
Astrophysical Journal v.418, p.812
Astronomy and Astrophysics
Astronomy
117
Galaxies: Magellanic Clouds, Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Agb And Post-Agb
Scientific paper
We present a chemical analysis of seven luminous asymptotic giant branch stars and one M supergiant of the Small Magellanic Cloud. The abundances are derived from high-resolution spectra by spectrum synthesis using new, spherically symmetric, opacity sampling model atmospheres. The average metallicity is [Fe/H] = -0.5, in accordance with other determinations of the SMC's metallicity. The AGB stars show signs of envelope burning, being Li rich, C poor, and with a low 12C/13C ratio. The s-process elements (Rb, Zr, Nd) abundance pattern is different from that in the solar system, and is characteristic of a high exposure at low neutron density. This is not peculiar to the SMC, however, but seems to be an effect of metallicity: Galactic Ba, CH, and S-type stars at the same metallicity display similar s-process element abundance patterns. Apparently, the 13C neutron source is operating in these intermediate-mass thermally pulsing AGB stars.
Lambert David L.
Plez Bertrand
Smith Verne V.
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