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S stars in the Gaia era: stellar parameters and nucleosynthesis

  • Sophie Van Eck (a1), Drisya Karinkuzhi (a1), Shreeya Shetye (a1) (a2), Alain Jorissen (a1), Stéphane Goriely (a1), Lionel Siess (a1), Thibault Merle (a1) and Bertrand Plez (a3)...

Abstract

S stars are s-process and C-enriched (0.5<C/O<1) red giants. Their abundances can be determined thanks to a new grid of MARCS model atmospheres covering their whole parameter range. Detailed abundance determinations in intrinsic S stars (TP-AGB) and extrinsic S stars (binary masqueraders) can provide strong constraints on the s-process nucleosynthesis: in particular, the s-process temperature can be determined using zirconium and niobium abundances, independently of stellar evolution models. Synthetic spectra of dwarf S stars have been computed and will be sought for in spectroscopic survey data, constraining their luminosity thanks to Gaia parallaxes.

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References

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Gustafsson, B., Edvardsson, B., Eriksson, K., Jørgensen, U. G., Nordlund, Å & Plez, B., 2008, A&A, 486, 951970
Van Eck, S., Neyskens, P., Jorissen, A., Plez, B., Edvardsson, B., Eriksson, K., Gustafsson, B., Jørgensen, U. G., & Nordlund, Å, 2017, A&A, 601, A10
Raskin, G., Van Winckel, H., Hensberge, H., Jorissen, A., Lehmann, H. et al., 2011, A&A, 526, A69
Neyskens, P., Van Eck, S., Jorissen, A., Goriely, S., Siess, L., & Plez, B., 2015, Nature, 517, 174
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