The HIPPARCOS HR Diagram of S Stars: Probing Nucleosynthesis and Dredge-Up

Details The HIPPARCOS HR Diagram of S Stars: Probing Nucleosynthesis and Dredge-Up The HIPPARCOS HR Diagram of S Stars: Probing Nucleosynthesis and Dredge-Up

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..327v&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 327-330

Computer Science

Scientific paper

Hipparcos parallaxes are used to construct the HR diagram of a sample of 30 S stars with sigma_pi / pi< 0.85. Extrinsic (i.e. Tc-poor, binary) S stars are bluer and fainter than intrinsic (i.e. Tc-rich) S stars. The comparison with theoretical evolutionary tracks indicates that Tc-rich S stars appear at the onset of thermal pulses on the asymptotic giant branch. A comparison is also made with the Magellanic Cloud S and C stars.

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