出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：An abundance analysis for 35 chemical elements based on a high-resolution (R = 67 000) optical spectra of two metal-poor ([Fe/H] ≈ −1:50) halo red giants, HD 232078 and HD 218732 is pre- sented. Abundances of ten chemical elements were derived for the first time. Both red giants are chromospherically active and optically variable, located close to the red giant branch tip. Abun- dances of both stars generally follow typical halo star abundance distribution, while HD 218732 should have experienced a deep mixing episode and could be a first ascent AGB star.
