Heavy-element abundances in the classical barium star HR 774

Journal Article · Sat Oct 15 04:00:00 EDT 1983 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/161408· OSTI ID:6742157

Tomkin, J; Lambert, D L

Low-noise high-resolution Digicon and Reticon spectra of HR 774 are analyzed to determine abundances for all accessible heavy elements in the visual and near-infrared. We find evidence of departures from LTE as large as 0.5 dex affecting the low-excitation neutral lines of heavy elements in HR 774 and the standard star (..beta.. Gem). These severe effects cancel in a comparison of HR 774 with ..beta.. Gem. Thus neutral lines do give reliable abundances relative to the standard, if the standard is a similar giant and not the Sun.

• Research Organization: McDonald Observatory and Department of Astronomy, University of Texas at Austin
• OSTI ID: 6742157
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 273:2; 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
ALKALINE EARTH METALS
ATMOSPHERES
BARIUM
BARYONS
CHEMICAL COMPOSITION
ELEMENTARY PARTICLES
ELEMENTS
EQUILIBRIUM
FERMIONS
HADRONS
LTE
MATHEMATICAL MODELS
METALS
NEUTRONS
NUCLEONS
NUCLEOSYNTHESIS
S PROCESS
SPECTRA
STAR EVOLUTION
STAR MODELS
STARS
STELLAR ATMOSPHERES
SYNTHESIS
VISIBLE SPECTRA