Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.306..317k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 306, Issue 2, pp. 317-326.
Astronomy and Astrophysics
Astronomy
31
Galaxies: Abundances, Galaxies: Evolution
Scientific paper
The general structure of the solutions of the chemical-evolution equations of a galaxy undergoing an arbitrary time-dependent accretion of metal-free gas is studied with graphical analysis. The behaviour is determined by the time evolution of the ratio a of accretion to star formation rate. This gives rise to two distinct regimes. (a) If a decreases monotonically with time, the properties are always between those predicted from the Simple Model and a Linear Accretion Model; the stellar mean metallicity and the abundance ratio of secondary and primary elements are thus restricted to a narrow range of a factor of 2. (b) Lower gas metallicities, larger secondary/primary ratios and stellar metallicities than expected from the Linear Accretion Models can only be reached if the accretion rate increases rapidly to a value larger than the star formation rate, e.g. by sudden massive accretion of gas into highly evolved gas-poor galaxies.
Edmunds Michael G.
Köppen Joachim
No associations
LandOfFree
Gas flows and the chemical evolution of galaxies - III. Graphical analysis and secondary elements 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 Gas flows and the chemical evolution of galaxies - III. Graphical analysis and secondary elements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas flows and the chemical evolution of galaxies - III. Graphical analysis and secondary elements will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1797191