Gaia EDR3 Data of Post-AGB Stars with Overabundance of s-process Elements: Evolutionary Status and Binarity | Zendy

M. Parthasarathy | Zendy

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Gaia EDR3 Data of Post-AGB Stars with Overabundance of s-process Elements: Evolutionary Status and Binarity

Author(s) -

M. Parthasarathy

Publication year - 2022

Publication title -

research notes of the aas

Language(s) - English

Resource type - Journals

ISSN - 2515-5172

DOI - 10.3847/2515-5172/ac54bb

Subject(s) - asymptotic giant branch , stars , physics , astrophysics , nucleosynthesis , supergiant , astronomy , s process

Kamath et al. analyzed Gaia EDR3 data of 18 post-asymptotic giant branch (AGB) supergiants having overabundance of s -process elements, some of which exhibit unusually low luminosities in disagreement with expectations of s -process nucleosynthesis. I have examined the Gaia RUWE statistics of these stars, and find that 13 have RUWE ≫ 1.4, suggesting they are most likely unresolved binaries that contain low-mass companions. The remaining five stars have RUWE < 1.4 and I find that their luminosities are in agreement with post-AGB evolutionary tracks.

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