1999/12/01 by C. Abia, Carlos Abia, Abia, Carlos +3
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9912025
8 pages, 2 figures, 1 table. Presented in "The Abundances Changes in AGB Stars", Mem. Soc. Astr. It., Monte Porzio, Italia 1999. Needs memsait.sty
arxiv created 1999/12/01 · arxiv updated 2009/12/01
Abundances of lithium, heavy elements and carbon isotope ratios have been derived in 12 J-type galactic carbon stars. The abundance analysis shows that in these stars the abundances of s-process elements with respect to the metallicity are nearly solar. Tc is not present in most of them. The Rb abundances, obtained from the resonance 7800 Å RbI line, are surprisingly low, probably due to stroong non-LTE effects. Lithium and 13C are found to be enhanced in all the stars. These results are used to discuss the origin of J-stars.