منابع مشابه
Analysis of 26 Barium Stars ⋆ , ⋆ ⋆ I . Abundances
Context. We present a detailed analysis of 26 barium stars, including dwarf barium stars, providing their atmospheric parameters (T eff , log g, [Fe/H], v t) and elemental abundances. Aims. We aim at deriving gravities and luminosity classes of the sample stars, in particular to confirm the existence of dwarf barium stars. Accurate abundances of chemical elements were derived. Abundance ratios ...
متن کاملAnalysis of 26 Barium Stars ⋆ , ⋆ ⋆ II . Contributions
Context. Barium stars show enhanced abundances of the slow neutron capture (s-process) heavy elements, and for this reason they are suitable objects for the study of s-process elements. Aims. The aim of this work is to quantify the contributions of the s-, r-and p-processes for the total abundance of heavy elements from abundances derived for a sample of 26 barium stars. The abundance ratios be...
متن کاملAluminum 26 production in asymptotic giant branch stars
The production of 26Al in asymptotic giant branch (AGB) stars is studied based on evolutionary stellar models of different masses (1.5 ≤ M/M ≤ 6) and metallicities (0.004 ≤ Z ≤ 0.02). It is confirmed that 26Al is efficiently produced by hydrogen burning, but destruction of that nuclei by n-capture reactions during the interpulse and pulse phases becomes increasingly more efficient as the star e...
متن کاملColor - Induced Displacement double stars in SDSS
We report the first successful application of the astrometric color-induced displacement technique (CID, the displacement of the photocenter between different bandpasses due to a varying contribution of differently colored components to the total light), originally proposed by Wielen (1996) for discovering unresolved binary stars. Using the Sloan Digital Sky Survey (SDSS) Data Release 1 with ∼ ...
متن کاملAnti-Ramsey numbers of spanning double stars
In this paper we shall prove and sharpen a conjecture of A. Bialostocki on anti-Ramsey colorings of the complete graph Kn. Assume the edges of a Kn are colored by t colors. The basic question is how many colors ensure that Kn has a spanning subtree of diameter at most d in which each edge has a different color. The surprising fact is that the answers are the same for every d ≥ 3. Moreover, we c...
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ژورنال
عنوان ژورنال: Transactions of the International Astronomical Union
سال: 1982
ISSN: 0251-107X
DOI: 10.1017/s0251107x00004673