DOI

CNO and Li abundances and 12C/13C isotopic ratios have been derived for two metal-poor Ba giants, HD 104340 and HD 206983, and two CH subgiants, HD 50264 and HD 87080. High resolution spectra obtained with the 1.52 m telescope and the FEROS echelle spectrograph at ESO, La Silla, Chile, were used in this study. CNO and Li abundances so as 12C/ 13C isotopic ratios were determined by applying the synthetic spectrum method to the lines of C2, CH, CN, [O I and Li I. Our analysis showed that the giant stars studied here have quite different natures: HD 206983 is a metal-poor barium star while HD 104340, although showing enhancement of s-process elements, should not be considered as a classical barium star: its barium syndrome can be explained by internal nucleosynthesis. The low metallicity giant HD 104340 can experience deeper convective mixing and, consequently, a larger dredge-up of CNO-cycle products compared to normal red giants. Light element abundance pattern of HD 104340 resembles anomalies resulting from the appearance on the stellar surface of material enriched in triple- and CNO cycling.

Язык оригиналаанглийский
Страницы (с-по)304-306
Число страниц3
ЖурналProceedings of the International Astronomical Union
Том2
Номер выпускаS239
DOI
СостояниеОпубликовано - 1 авг 2006

    Предметные области Scopus

  • Медицина (разное)
  • Астрономия и астрофизика
  • Пища и диетология
  • Здравоохранение, защита окружающей среды и гигиена труда
  • Космические науки и планетоведение

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