The comparison of the derived s-processĪbundance profiles of our intrinsic S stars with the nucleosynthesis These findings are consistent with Tc-rich In the HR diagram, the intrinsic S stars are located at higher luminosities Stellar parameters we determine the heavy-element abundances by line synthesis. Models and tailored MARCS model atmospheres for S-type stars. High-resolution spectra, accurate Gaia EDR3 parallaxes, stellar evolution Stellar parameters are derived using an iterative tool which combines HERMES We also compare ourĪbundance determinations with dedicated AGB nucleosynthesis predictions. Onset of the TDU in the metallicity range. With our previous studies of 10 Tc-rich stars to determine the observational We combine the current sample of 13 Tc-rich stars Locating them in a Hertzsprung-Russell (HR) diagram using the results of GaiaĮarly Data Release 3 (EDR3). Our goal is to investigate the evolutionary status of Tc-rich S stars by Material from an AGB companion which has since turned into a dim white dwarf. Stars gained their s-process overabundances via accretion of s-process-rich (TP-)AGB stars internally producing s-process elements (including Tc) which areīrought to their surface via the third dredge-up (TDU). The Tc-rich or intrinsic S stars are thermally-pulsing Two types: intrinsic or extrinsic, based on the presence or absence of Constraining the luminosity of the third dredge-up with Tc-rich S stars, by Shreeya Shetye and 8 other authors Download PDF Abstract: S stars are late-type giants that are transition objects between M-type starsĪnd carbon stars on the asymptotic giant branch (AGB). Download a PDF of the paper titled S stars and s-process in the Gaia era II.
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