Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jkas...29...63p&link_type=abstract
Journal of the Korean Astronomical Society, vol. 29, no. 1, p. 63-73
Astronomy and Astrophysics
Astronomy
Initial Mass Function, Star Formation Rate, Abundance Gradient, Chemical Evolution
Scientific paper
The previous study of chemical evolution of the Galaxy is extended to the radial properties of the Galactic disk. The present model includes radial dependency of the time-dependent bimodal IMF, radial flow of material in the disk, and the change of type I supernova explosion rate with radial distance from the disk center as model parameters and observed gas and stellar density distributions and metallicity abundance gradient as observational constraints. The results of two models in this study explain the observed gas and stellar density distributions well, with the slope of the gas density gradient in the region of 4.5 kpc < r < kpc as -0.136 dex/kpc in model Y1 and -0.123 dex/kpc in model Y2, respectively, which fit well the observed gradient of -0.11 dex/kpc The abundance gradient reproduced in model Y1 is getting flatter with decreasing radius, while that in model Y2 is getting steeper, which fits better the observed abundance gradient. This result shows the necessity of exponentially increasing type I supernova explosion rate with decreasing radius in order to explain the observed abundance gradient in the disk. The fitness of observed density distribution and star formation rate distribution justifies the reliability of time-dependent bimodal IMF as a compound quantitative chemical evolution model of the Galaxy. The temporal variations of metallicity gradients for carbon, nitrogen and oxygen are also shown.
Kang Yong Hee
Lee See-Woo
Park Byeong-Gon
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