Conveners
10 Element production & stellar evolution II
- Robert Hoffman (LLNL, Livermore)
Corinne Charbonnel
(Geneva Observatory & CNRS)
28/06/2006, 11:00
Element production, stellar evolution and stellar explosions
Invited
Galactic globular clusters (GC) stars exhibit abundance patterns which are not shared
by their field counterparts, e.g. the well-documented O-Na and Mg-Al
anticorrelations. Recent observations provided compelling evidence that these
abundance anomalies were already present in the intracluster gas from which the
observed stars formed. A widely held hypothesis is that the gas was polluted...
Kaori Otsuki
(University of Chicago)
28/06/2006, 11:30
Element production, stellar evolution and stellar explosions
Oral contribution
We report on observations of six giants in the globular cluster M15 (NGC 7078).
The Subaru/HDS was used to measure neutron-capture elemental abundances.
Previous studies have reported a significant star-to-star variation in the
neutron-capture elemental abundances of M15, and deduced that their origin was from
the r-process. Our abundance analyses based on high-quality blue spectra...
Yuhri Ishimaru
(Academic Support Center, Kogakuin University)
28/06/2006, 11:50
Evidences of nucleosynthesis in stars and in presolar grains
Oral contribution
Metal-poor stars record enrichment history of the Galaxy at the early epoch.
Abundance analysis of these stars reveals large star-to-star scatters in r-process
elements. This may be interpreted as a result of incomplete mixing of the
interstellar medium (ISM) at the beginning of the Galaxy. However, recent studies
also show considerable small dispersions for abundance ratios of C-Zn...
Robert Izzard
(University of Utrecht)
28/06/2006, 12:10
Element production, stellar evolution and stellar explosions
Oral contribution
We study the effect of uncertainties in the proton-capture reaction rates
on nucleosynthesis due to the operation of the NeNa and MgAl chains during
hot bottom burning (HBB) in intermediate-mass asymptotic giant branch
(AGB) stars. This kind of nucleosynthesis is associated with the production
of sodium, of the radioactive nucleus Al26 and of the heavy magnesium isotopes, and
it is...
Martin Asplund
(Australian National University)
28/06/2006, 12:30
Element production, stellar evolution and stellar explosions
Invited
In the Sun, the convection zone reaches up to the solar atmosphere
and can thus directly influence the emergent spectrum. Traditionally,
the effects of convection has been modelled with the local mixing
length theory in 1D hydrostatic model atmospheres for
stars like the Sun. In a different approach, we have performed
realistic time-dependent, 3D, radiative-hydrodynamical...
