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Title:
The Mysterious R Stars
Authors:
Izzard, Robert G.; Jeffery, C. Simon; Lattanzio, John
Affiliation:
AA(Sterrekundig Institute, Universiteit Utrecht, Postbus 80000, 3508 TA, Utrecht, The Netherlands; School of Mathematical Sciences, PO Box 28M, Monash University, Victoria 3800, Australia), AB(Armagh Observatory, College Hill, Armagh, BT61 9DG, Northern Ireland), AC(School of Mathematical Sciences, PO Box 28M, Monash University, Victoria 3800, Australia)
Publication:
IXTH TORINO WORKSHOP ON EVOLUTION AND NUCLEOSYNTHESIS IN AGB STARS AND THE IIND PERUGIA WORKSHOP ON NUCLEAR ASTROPHYSICS. AIP Conference Proceedings, Volume 1001, pp. 33-37 (2008). (AIPC Homepage)
Publication Date:
04/2008
Origin:
AIP
PACS Keywords:
Stellar structure, interiors, evolution, nucleosynthesis, ages, Origin, formation, and abundances of the elements, Giant and subgiant stars, Carbon stars, S stars, and related types, Abundances, chemical composition, Spectroscopic binaries; close binaries
DOI:
10.1063/1.2916984
Bibliographic Code:
2008AIPC.1001...33I

Abstract

The R stars are a rare class of K-type giant carbon stars. Canonical stellar evolutionary theory cannot explain their existence, yet they have been observed for more than a century. The early-R stars, the warmest in the R class, are enhanced in 12C, 13C and 14N relative to the Sun, but not in s-processes elements or oxygen, and are all single stars. We test the idea that binary mergers lead to the formation of the early-R stars by a comparison of binary population synthesis model results with observations.
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