Open AccessGaia 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.