2005/07/18 by M. R. Villamariz, A. Herrero · 1 citation
Mathematics · Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Binary number #Binary star #Effective temperature #Galaxy #Luminosity #Mathematics #Observable #Physics #Proper motion #Star (game theory) #Stars #Stellar evolution #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1051/0004-6361:20052848
Accepted for publication in A&A
arxiv created 2005/07/18 · openalex publication_date 2005/09/30 · arxiv updated 2009/12/01 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/05
ζ Oph, HD 149757, is an O9.5 Vnn star with a very high projected rotational velocity (v sin km s-1). It is also a classical runaway star due to its high proper motion. We perform a quantitative analysis of its optical spectrum in order to measure important observables of the star such as its mass, effective temperature, luminosity and He, C, N, and O abundances. Comparing these observed values to those predicted by the rotating evolutionary models of the Geneva group we find that none of the two sets of models (those of 2000 and 2003) is capable of reproducing the characteristics of the star. Nevertheless, due to its runaway nature, the reason for this discrepancy may be that the star is not the result of the evolution of a single object, but the product of the evolution of a close binary system.