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Chemically Peculiar A and F Stars with Enhanced s-process and Iron-peak Elements: Stellar Radiative Acceleration at Work

Xiang, Mao-Sheng; Rix, Hans-Walter; Ting, Yuan-Sen; Ludwig, H.-G.; Coronado, Johanna; Zhang, Meng; Zhang, Hua-Wei; Buder, Sven; Dal Tio, Piero

Description

We present 15,000 metal-rich ([Fe/H] > −0.2 dex) A and F stars whose surface abundances deviate strongly from solar abundance ratios and cannot plausibly reflect their birth material composition. These stars are identified by their high [Ba/Fe] abundance ratios ([Ba/Fe] > 1.0 dex) in the LAMOST DR5 spectra analyzed by Xiang et al. They are almost exclusively main-sequence and subgiant stars with Teff  6300 K. Their distribution in the Kiel diagram (Teff–log g) traces a sharp border at low...[Show more]

CollectionsANU Research Publications
Date published: 2020
Type: Journal article
URI: http://hdl.handle.net/1885/269965
Source: The Astrophysical Journal
DOI: 10.3847/1538-4357/ab99a5
Access Rights: Open Access

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