Mathematics – Logic
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..204..419h&link_type=abstract
The Extragalactic Infrared Background and its Cosmological Implications, Proceedings of IAU Symposium #204, held 15-18 August 20
Mathematics
Logic
Scientific paper
We have made a detailed investigation of the abundance gradient evolution along the Galactic disk for all currently observationally available chemical elements. The Galacticchemical evolution model was quite successful in reproducing the main observational constraints in the solar neighborhood as well as in predicting a large volume of observables in high red-shifts spirals (Boissier and Prantzos 1999, 2000). The studied elements include He, C, N, O, Ne, Mg, Al, Si, S, Ar, and Fe. For the current gradients, we find good overall agreement between theory and observations. For the time evolution, the model predicts the flatting tendency for all the elements. We have utilised the planetary nubulae data of N, Ne, S, Ar as observational constraints for gradient evolution since PNI, PNII, and PNIII are supposed to be formed at different galactic ages. Actually, from an observational point of view, it is now not sure whether there exists gradients evolving with time. Or if they exist, it is difficult to conclude whether the gradient steepens or flattens with time. Based on a comparison of abundance ratio gradients between theory and observations, we have discussed the difference between Maeder (1992) and WW95(Woosely and Weaver 1995) yields for helium, carbon and nitrogen. We conclude that intermediate mass stars are clearly needed for producing the necessary yield for those elements.
Boissier Samuel
Hou Jinliang
Prantzos Nikos
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