Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1001..205a&link_type=abstract
IXTH TORINO WORKSHOP ON EVOLUTION AND NUCLEOSYNTHESIS IN AGB STARS AND THE IIND PERUGIA WORKSHOP ON NUCLEAR ASTROPHYSICS. AIP C
Astronomy and Astrophysics
Astrophysics
Carbon Stars, S Stars, And Related Types, Population Ii Stars, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Abundances, Chemical Composition, Dwarf Galaxies, Spectroscopy And Spectrophotometry
Scientific paper
We present a chemical analysis of two metal-poor carbon stars belonging to the Carina Dwarf Spheroidal galaxy using high resolution optical spectra obtained with the VLT/UVES instrument. Their derived properties and chemical composition are compatible with these stars being in the TP-AGB phase undergoing third dredge-up episodes, although their extrinsic nature cannot be definitively discarded. The analysis indicates that these stars have large s-element enhancements, which are compatible with theoretical s-process nucleosynthesis predictions in low-mass AGB stars (~1.5Msolar), and also large carbon enhancements (C/O>=5), much larger than the values typically found in galactic AGB carbon stars (C/O~1-2). This is also in agreement with the theoretical prediction that carbon stars are formed more easily through third dredge-up episodes as the initial stellar metallicity drops. We speculate on the possibility that the abundance pattern found in the low-mass s-elements (Y, Zr) may be revealing the existence of some chemical depletion into dust grains.
Abia Carlos
Cristallo Sergio
de Laverny Patrick
Dominguez Inmaculada
Straniero Oscar
No associations
LandOfFree
Analysis of Two Carbon Stars in the Carina Dwarf Spheroidal Galaxy 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 Analysis of Two Carbon Stars in the Carina Dwarf Spheroidal Galaxy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analysis of Two Carbon Stars in the Carina Dwarf Spheroidal Galaxy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1421638