Influence of Supernova SN Ia Rate and the Early Star Formation Rate on the Galactic Chemical EvolutionReport as inadecuate




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Based on the recently developed numerical approach to understandthe formation and the chemical evolution of the milky-way galaxy in the solar neighborhoodwe study the influence of the supernova type SN Ia rates on the galactic chemicalevolution. Supernova SN Ia plays an important role in producing the iron inventoryof the galaxy. We also study the dependence of the chemical evolution on the starformation rate prevailing during the initial one billion years of the evolutionof the galaxy. This era marks the formation of the galactic halo and the thick disk.A comparison of the elemental abundance distributions of the dwarf stars in thesolar neighborhood is made among the various models simulated in the present work.In order to explain the majority of the observed elemental evolutionary trends,specifically those related with the galactic evolution of iron and oxygen, it wouldbe essential to incorporate a major component of prompt SN Ia to the galactic evolution.The prompt SN Ia would produce significant fraction of SN Ia within the initial~100 million years from the time of star formation. The essential requirement ofprompt SN Ia would result in a significant enhancement of SN Ia rates during theearliest epoch of the galaxy. The elemental evolutionary trends also favor an enhancementin the star formation rate during the initial one billion years of the galaxy atleast by a factor of three compared to the trend prevailing during the latter evolutionarytime of the galaxy.

KEYWORDS

Galaxy Formation; Galactic Chemical Evolution; Stellar Nucleosynthesis; Star Formation; Supernovae

Cite this paper

S. Sahijpal -Influence of Supernova SN Ia Rate and the Early Star Formation Rate on the Galactic Chemical Evolution,- International Journal of Astronomy and Astrophysics, Vol. 3 No. 3, 2013, pp. 344-352. doi: 10.4236-ijaa.2013.33038.





Author: Sandeep Sahijpal

Source: http://www.scirp.org/



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