Chemical evolution in a multiple starburst environment. Odd abundance ratios in the light of the first generation of stars.

Details Chemical evolution in a multiple starburst environment. Odd abundance ratios in the light of the first generation of stars. Chemical evolution in a multiple starburst environment. Odd abundance ratios in the light of the first generation of stars.

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...293..652o&link_type=abstract

Astronomy and Astrophysics 293, 652-664 (1995)

Astronomy and Astrophysics

Astrophysics

16

Galaxies: Compact, Galaxies: Evolution Of, Galaxies: Individual (Izw18), Galaxies: Irregular, Galaxies: Abundances

Scientific paper

The cumulative temporal evolution of carbon, nitrogen and oxygen in the interstellar gas of star-forming regions has been studied using a numerical model of chemical evolution. In the context of searching for genuinely young galaxies it is shown that such an object would have, besides low elemental abundances, abnormal abundance ratios of (N/O) and (C/N) during the first few 10^7^years after the onset of its first burst of star formation. These ratios are much lower and higher, respectively, than what is observed in a sample of nearby blue compact and dwarf irregular galaxy youth candidates. This result is independent of the initial abundances of the cloud of gas from which the first stars are formed. It is shown that the chemical abundances and their ratios are extremely sensitive to the initial mass function and that the observations are well represented by a model with a solar neighbourhood initial mass function in a medium which has undergone several short bursts of star formation. The selected sample of blue compact and dwarf irregular galaxies could in fact appear as pristine objects if they lack stars less massive than ~2-3Msun_ or if they formed out of gas already enriched in heavy elements. It is shown that the different behaviour of (N/O) as a function of (O/H), often interpreted as due to various contributions of primary and secondary nitrogen, in fact could be an effect of stellar mass-loss as a function of metallicity.

Affiliated with

Also associated with

No associations

Rating

Chemical evolution in a multiple starburst environment. Odd abundance ratios in the light of the first generation of stars. 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 Chemical evolution in a multiple starburst environment. Odd abundance ratios in the light of the first generation of stars., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chemical evolution in a multiple starburst environment. Odd abundance ratios in the light of the first generation of stars. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1817599