|
The Ohio State University
College of Mathematical & Physical Sciences
Department of Astronomy Colloquium Series 2006/7
|
Thursday, Nov 9, 3:30 p.m.
2015 McPherson Laboratory
Stellar Nucleosynthesis in Galactic History: The Carbon Stars
Dr. Thomas Masseron
The Ohio State University
In the light of recent results on their nature, their origin and their
possible relation with stars of population III (still undiscovered!), I
will present results from high resolution chemical analysis of a large
sample of metal-poor carbon enhanced stars. I will first demonstrate
the impact of molecules on the thermal structure of the atmosphere, on
photometry and on the abundance determination. I will then discuss
abundance results from the extended sample. I will especially focus on
the heavy element abundances. It appears indeed that carbon enhanced
stars split into two groups: stars only enriched in s- elements and
stars enriched both in s- and r-elements. Finally, from the chemical
analysis we have carried out, it turns out that our sample includes also
a thermal pulsing asymptotic giant branch star, with an extremely low
content of metals, making it the most evolved star among metal-poor
stars.
Go to
[
2006/7 Colloquium Series
|
Calendar of Events
|
Astronomy Department Home
]
Modified 2006 Oct 10 [rwp]