Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..554h&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
Testing theoretical yields stemming from stars of different masses and therefore different lifetimes the early phases of galaxy evolution can provide fundamental insights into the early metal enrichment of the interstellar medium (ISM). In particular mixing processes between the different gas phases can be recognized by the analyses of the easily accessible elements oxygen and nitrogen (or carbon) which on the other hand are nucleosythesized in stellar progenitors of different masses and deposited into different phases of the ISM according to the connected energy release. In addition gas infall and outflow affect ratios and absolute abundances of these tracer elements. For damped-Lyman alpha systems it is generally accepted that we catch the nursery of more massive galaxies during their disk formation and our understanding of the observed N/O-O relations has recently profitted from better observations and improved theoretical yields. Since dwarf irregular galaxies (dIrrs) evolve in lower gravitational potentials internal or external energetic processes such as galactic winds and gas infall are expected to have larger influences on the chemical evolution. By means of chemodynamical models this early evolution of dIrrs is followed and will be discussed in the context of observations and theoretical evolutionary paths within the N/O-O metallicities.
Hensler Gerhard
Köppen Joachim
Recchi Simone
Rieschick Andreas
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