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- W2897069384 abstract "Abstract S-type stars are late-type giants enhanced with s -process elements originating either from nucleosynthesis during the Asymptotic Giant Branch (AGB) or from a pollution by a binary companion. The former are called intrinsic S stars, and the latter extrinsic S stars. The intrinsic S stars are on the AGB and have undergone third dredge-up events. The atmospheric parameters of S stars are more numerous than those of M-type giants (C/O ratio and s -process abundances affect the thermal structure and spectral synthesis), and hence they are more difficult to derive. These atmospheric parameters are also entangled within each other. Nevertheless, high-resolution spectroscopic data of S stars combined with the Gaia Data Release 2 (GDR2) parallaxes and with the MARCS model atmospheres for S-type stars were used to derive effective temperatures, surface gravities, and luminosities. These parameters not only allow to locate the intrinsic and extrinsic S stars in the Hertzsprung-Russell (HR) diagram but also allow the accurate abundance analysis of the s -process elements." @default.
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- W2897069384 date "2018-08-01" @default.
- W2897069384 modified "2023-09-26" @default.
- W2897069384 title "Probing stellar evolution with S stars and Gaia" @default.
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- W2897069384 doi "https://doi.org/10.1017/s1743921318005458" @default.
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