منابع مشابه
Rubidium, zirconium, and lithium production in massive AGB stars
D. Yong Research School of Astronomy and Astrophysics, Mt. Stromlo Observatory, Cotter Rd., Weston, ACT Australia A recent survey of a large sample of massive Galactic asymptotic giant branch (AGB) stars shows that significant overabundances of rubidium (up to 100 times solar) are present in these stars. Zirconium, on the other hand, is not enriched compared to the solar abundance. These observ...
متن کاملs-Process Nucleosynthesis in Low-Metallicity Stars
Nobuyuki IWAMOTO1,∗, Toshitaka KAJINO, Grant J. MATHEWS, Masayuki Y. FUJIMOTO and Wako AOKI National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan The Graduate University for Advanced Studies, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan Center for Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA Department of Physics, Hokkaido Univ...
متن کاملNuGrid : s process in massive stars
R. Hirschi∗abc, U. Frischknechtd , M. Pignatariabe, F.-K. Thielemannd , M. E. Bennettab, S. Diehla f g, C. L. Fryera f , F. Herwigabh, A. Hungerfordag, G. Magkotsiosaei, G. Rockefellerag, F. X. Timmesai, and P. Youngai aThe NuGrid Collaboration bAstrophysics Group, Keele University, ST5 5BG, UK cIPMU, University of Tokyo, Kashiwa, Chiba 277-8582, Japan dTheoretical Astrophysics Group, Universit...
متن کاملThe s-process in rotating AGB stars
We discuss the occurrence of the s-process during the radiative interpulse phase of rotating AGB stars. Due to differential rotation, protons are mixed into C-rich layers after thermal pulses, in the course of the so called third dredge up episode. We follow the time evolution of key isotope abundances in the relevant layers with a post-processing code which includes time dependant mixing and n...
متن کاملThe Henize sample of S stars IV . New symbiotic stars ⋆
The properties of the few symbiotic stars detected among the 66 binary S stars from the Henize sample are discussed. Two stars (Hen 18 and Hen 121) exhibit both a strong blue-violet continuum and strong Hα emission (FWHM of 70 km s ), whereas Hen 134 and 137 exhibit weak Hα emission. The Hα profiles are typical of non-dusty symbiotic stars belonging to class S-3 as defined by Van Winckel et al....
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1989
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/238.4.1365