CAOSP abstracts, Volume: 55, No.: 3, year: 2025

Author(s): Li, Z.; Zhang, Y.; Chen, H.; Ge, H.; Jiang, D.; Li, J.; Chen, X.; Han, Z.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 55, no. 3, p. 211-216.
Date: 04/2025
Title: A new route to massive helium-rich hot subdwarfs
Keyword(s): hot subdwarfs, asymptotic giant branch
Pages: 211 -- 216
DOI: https://doi.org/10.31577/caosp.2025.55.3.211
NASA ADS Abstract Service: 2025CoSka..55c.211L
Citation:
License: This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract: Hot subdwarf (SD) stars provide a valuable opportunity to study stellar evolution, binary evolution, and element diffusion. In the conventional binary evolution scenario, SDs are believed to be the stripped cores of red giants. Here, we propose a new formation process for massive hot subdwarfs called the asymptotic giant branch (AGB) common envelope (CE) channel, which involves a CE ejection with an AGB star. This alternative pathway can explain helium-rich SDs with log(n_He/n_H) > -1 due to the partial hydrogen burning in the envelope.