Physics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..948..191j&link_type=abstract
UNSOLVED PROBLEMS IN STELLAR PHYSICS: A Conference in Honor of Douglas Gough. AIP Conference Proceedings, Volume 948, pp. 191-1
Physics
Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Supergiant Stars
Scientific paper
The remarkable star FG Sge has evolved from a white dwarf to a yellow supergiant in a century. This evolution has been attributed to the re-ignition of shell-burning helium in a post-asymptotic giant branch star. Purportedly supporting this view, studies of FG Sge have argued that significant quantities of s-processed elements have been dredged to the surface over a forty year interval as the star has cooled. Carbon is also enhanced, but no evidence of hydrogen depletion has been presented, in contradiction to theoretical models of the shell ignition. In a re-analysis of the published data, we find that the evidence for a change in s-process elements is marginal, but that there has been a significant increase in surface carbon and helium. This result agrees better with theoretical predictions, but the onset of dredge-up is still markedly earlier than expected and represents a continuing challenge for stellar evolution and convection theory.
Jeffery Simon
Schönberner Detlef
No associations
LandOfFree
Surface Abundances in FG Sge: a Test of Stellar Evolution Theory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Surface Abundances in FG Sge: a Test of Stellar Evolution Theory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface Abundances in FG Sge: a Test of Stellar Evolution Theory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1696172