Heavy-element abundances in the mild barium stars Omicron Virginis and 16 Serpentis

Journal Article · Mon Dec 01 04:00:00 EST 1986 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/164821· OSTI ID:6581368

Tomkin, J; Lambert, D L

High-resolution Digicon and Reticon observations are used to determine detailed heavy-element abundances for the mild barium stars O Vir and 16 Ser and a standard star (Ep Vir). A comparison of their heavy-element abundances with those of the classical Ba II stars does not reveal any significant difference in the element-to-element ratios, but the overall enhancements (relative to iron) are smaller in the mild barium stars. This suggests that the mild barium stars originated from the same binary mechanism as the classical Ba II stars. The initial masses of the Ba II stars' former AGB components may have been significantly less than those of normal field red giants. Low masses for the Ba II star progenitors imply that the Ba II stars, while they belong to Population I, are older than the average Population I object, and so account for their observed tendency to be metal deficient. 47 references.

• Research Organization: Texas Univ., Austin
• OSTI ID: 6581368
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 311; 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
BARIUM
BINARY STARS
CHEMICAL COMPOSITION
ELEMENT ABUNDANCE
ELEMENTS
GIANT STARS
MASS
MASS TRANSFER
METALS
RED GIANT STARS
SPECTROPHOTOMETRY
STAR EVOLUTION
STARS