Analysis of Gaia DR3 Data of Selected R Stars (Warm Carbon Stars)

Abstract An analysis of Gaia DR3 data of 67 R stars is presented and 57 of them are at high galactic latitudes. Three new variable stars are found. The long period luminous variable R stars and R8 stars may be variable carbon stars on the Asymptotic Giant Branch. The R stars seem to have luminosities throughout the Red Giant Branch range. Several R stars are found to be high velocity stars. The determination of s -process elements abundances and C12/C13 ratio of the stars listed in Table 1 will enable us to further understand the R stars phenomenon. The process by which the atmospheres of these stars are enriched with carbon is still a puzzle.