Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...260..115j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 260, no. 1-2, p. 115-132.
Astronomy and Astrophysics
Astrophysics
62
S Stars, Stellar Evolution, Stellar Orbits, Symbiotic Stars, Binary Stars, Stellar Spectra
Scientific paper
The hypothesis of an evolutionary link between barium stars and the non-Mira S stars is discussed. The hypothesis of an evolutionary link between the barium stars and the non-Mira S stars is confirmed. The mass function distribution of S stars, indicating that the companions are likely white dwarfs, as is the case for barium stars, supports this hypothesis. However, systems with periods shorter than 600 d appear to be lacking among S stars, although they are present among barium stars. Moreover, S stars appear to be less massive on the average than barium stars. It is suggested that these differences between the two families can be naturally explained by assuming that non-Mira S stars (without Tc) populate the first giant branch instead of the asymptotic branch. A synoptic view of the evolutionary paths followed by low- and intermediate-mass binary systems is presented, with special emphasis on the relationships between the families of peculiar red giants.
Jorissen Alain
Mayor Marcel
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