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Recently Kamath et al. (2021) analysed Gaia EDR3 data of eighteen post-AGBsupergiants with overabundance of s-process elements. For some of these starsin their sample they find unusually very low absolute luminosities which is notin agreement with the s-process nucleosynthesis on the AGB stage of evolution.It appears that they have not taken into account the RUWE values of thesestars. I have taken a look at the RUWE values of these eighteen post-AGB starswith over abundance of s-process elements. Of the eighteen stars thirteen haveRUWE values much greater than 1.4 and hence their distances (absoluteluminosities) are not reliable. As per the study of Stassun and Torres (2021)stars with Gaia EDR3 RUWE values greater than 1.4 are most likely unresolvedbinaries in Gaia data base. Thus some of the s-process rich post-AGB stars aremost likely contain unresolved low-mass binary companions. Only five stars(IRAS 07134+1005, IRAS 08143-4406, IRAS 12360-5740, IRAS 19500-1709 and IRAS22272+5435) of these eighteen s-process rich stars have accurate Gaia EDR3parallaxes and RUWE values less than 1.4 and their absolute luminosities are inagreement with the post-AGB evolutionary tracks.

Gaia EDR3 data of post-AGB stars with overabundance of s-process elements and their evolutionary status and binarity