What Causes the Abundance Gradient and its Evolution along the Galaxy Disk?

Details What Causes the Abundance Gradient and its Evolution along the Galaxy Disk? What Causes the Abundance Gradient and its Evolution along the Galaxy Disk?

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..404...36h&link_type=abstract

The Eighth Pacific Rim Conference on Stellar Astrophysics: A Tribute to Kam-Ching Leung ASP Conference Series, Vol. 404, proceed

Astronomy and Astrophysics

Astrophysics

Scientific paper

Based on a simple model of the chemical evolution of the Milky Way disk, we investigate the disk abundance gradient and its time evolution. Two star formation rates (SFRs) are considered, one is the classical Kennicutt-Schmidt law ( Ψ = 0.25 Σgas1.4, hereafter C-KS law), another is the modified Kennicutt law (Ψ = α Σgas1.4 ( {V/r} ), hereafter M-KS law). We made a detailed comparison for the past history of abundance gradient by using tracers of planetary nebulae and open clusters along the Milky Way disk. We find that for an individual Milky Way-type galaxy, a better description about the local SFR is the modified KS law.

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