Zobrazeno 1 - 10
of 70
pro vyhledávání: '"Zappala R"'
We have investigated the role of the convective overshooting on the production of s-nuclei during core He-burning phase in stellar models with different initial mass and metallicity ($15 \leq M_{ZAMS}/M_{\odot} \leq 25$; $10^{-4} \leq Z \leq 0.02$),
Externí odkaz:
http://arxiv.org/abs/1109.1768
With the "post-processing" technique we explore the role of the convective overshooting on the production of s-nuclei in stellar models of different initial mass and metallicity ($15 \leq M_{ZAMS}/M_{\odot} \leq 25$; $10^{-4} \leq Z \leq 0.02$), cons
Externí odkaz:
http://arxiv.org/abs/1009.5333
Super-AGB stars can conclude their evolution either as neon-oxygen white dwarfs or as electron-capture supernovae. We discuss the possible consequences of the existence of this "double final fate" in the self-enrichment of globular clusters and in th
Externí odkaz:
http://arxiv.org/abs/0902.0913
Publikováno v:
INAF- Catania Astrophysical Observatory Special Publications, 2008, 1, 105
Based on evolutionary computations of 90 stellar models, we have analysed the impact of initial composition and core overshooting on the post-He-burning evolution and the associated nucleosynthesis of Super-AGB stars, pointing particular attention on
Externí odkaz:
http://arxiv.org/abs/0805.3611
Publikováno v:
INAF- Catania Astrophysical Observatory Special Publications, 2008, 1, 97
Current models of s-nucleosynthesis in massive stars ($M\sim15 M_{\odot}$ to $\sim 30 M_{\odot}$) are able to reproduce some main features of the abundance distributions of heavy isotopes in the solar system, at least in the $A\sim 60-90$ mass range.
Externí odkaz:
http://arxiv.org/abs/0805.3607
Publikováno v:
Astron.Astrophys. 428 (2004) 121-129
Despite numerous efforts, the transition from Asymptotic Giant Branch (AGB) stars to Planetary Nebulae (PN) is a poorly understood phase of stellar evolution. We have therefore carried out interferometric (VLA) radio observations of a sample of hot p
Externí odkaz:
http://arxiv.org/abs/astro-ph/0409333
Despite of numerous efforts, the stage from Asymptotic Giant Branch (AGB) to Planetary Nebulae (PN) is a poorly understood phase of stellar evolution. We have therefore carried out interferometric (VLA) observations of a sample of hot post-AGB stars,
Externí odkaz:
http://arxiv.org/abs/astro-ph/0310190
Several blazars, and BL Lac objects in particular, show a misalignment between the jet orientation on parsec and kiloparsec scales. Some authors (i.e. Conway & Murphy, 1993) have attempted to explain this behaviour invoking helical jets for misalignm
Externí odkaz:
http://arxiv.org/abs/astro-ph/0111279
The most detailed calculations of the p-process call for its development in the O/Ne layers of Type II supernovae. In spite of their overall success in reproducing the solar system content of p-nuclides, they suggest a significant underproduction of
Externí odkaz:
http://arxiv.org/abs/astro-ph/0005513
We have observed 28 sources selected from the 1Jy sample of BL Lac objects (Stickel et al. 1991) with the Very Large Array (VLA) in A, B and D configurations at 1.36, 1.66 and 4.85 GHz, and/or with the Westerbork Synthesis Radio Telescope (WSRT) at 1
Externí odkaz:
http://arxiv.org/abs/astro-ph/9910209