Skip to main content

Research Repository

Advanced Search

Are some CEMP-s stars the daughters of spinstars?

Choplin, Arthur; Hirschi, Raphael; Meynet, Georges; Ekström, Sylvia

Are some CEMP-s stars the daughters of spinstars? Thumbnail


Arthur Choplin

Georges Meynet

Sylvia Ekström


Carbon-enhanced metal-poor (CEMP)-s stars are long-lived low-mass stars with a very low iron content as well as overabundances of carbon and s-elements. Their peculiar chemical pattern is often explained by pollution from an asymptotic giant branch (AGB) star companion. Recent observations have shown that most CEMP-s stars are in binary systems, providing support to the AGB companion scenario. A few CEMP-s stars, however, appear to be single. We inspect four apparently single CEMP-s stars and discuss the possibility that they formed from the ejecta of a previous-generation massive star, referred to as the “source” star. In order to investigate this scenario, we computed low-metallicity massive-star models with and without rotation and including complete s-process nucleosynthesis. We find that non-rotating source stars cannot explain the observed abundance of any of the four CEMP-s stars. Three out of the four CEMP-s stars can be explained by a 25M? source star with vini ~ 500 km?s-1 (spinstar). The fourth CEMP-s star has a high Pb abundance that cannot be explained by any of the models we computed. Since spinstars and AGB predict different ranges of [O/Fe] and [ls/hs], these ratios could be an interesting way to further test these two scenarios. nuclear reactions, nucleosynthesis, abundances / stars: interiors / stars: chemically peculiar / stars: abundances / stars: massive

Journal Article Type Article
Acceptance Date Oct 16, 2017
Online Publication Date Oct 16, 2017
Publication Date 2017-11
Publicly Available Date May 26, 2023
Journal Astronomy and Astrophysics
Print ISSN 2329-1273
Publisher Hans Publishers
Peer Reviewed Peer Reviewed
Volume 607
Article Number L3
Keywords nuclear reactions, nucleosynthesis, abundances, stars, interiors, chemically peculiar, massive
Publisher URL


You might also like

Downloadable Citations