/sup 12/C//sup 13/C ratio in stellar atmospheres. VIII. The very metal-deficient giant HD 122563

Journal Article · Fri Jul 15 04:00:00 EDT 1977 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/155393· OSTI ID:7319435

Lambert, D L; Sneden, C

High-resolution Digicon spectra of the CH 4300 A band in the metal-deficient giant HD 122563 are analyzed for the atmospheric /sup 12/C//sup 13/C ratio. Nine /sup 13/CH lines are identified. A ratio /sup 12/C//sup 13/C=5 +- 2 is deduced. This low value shows that the present atmosphere has been seriously affected by internal mixing and processing. This extreme mixing is not predicted by stellar evolutionary calculations. It is suggested that the anomalous abundances of CNO may be explained on the assumption that modified products of He burning in the core or in a shell have been mixed to the surface.

• Research Organization: McDonald Observatory and Department of Astronomy, University of Texas
• OSTI ID: 7319435
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 215:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ATMOSPHERES
CARBON 12
CARBON 13
CARBON ISOTOPES
CHEMICAL COMPOSITION
CHEMISTRY
COSMOCHEMISTRY
ENERGY LEVELS
ENERGY SPECTRA
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GIANT STARS
ISOTOPE RATIO
ISOTOPES
LIGHT NUCLEI
NUCLEI
NUCLEOSYNTHESIS
SPECTRA
STABLE ISOTOPES
STAR EVOLUTION
STARS
STELLAR ATMOSPHERES