Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-06-26
Mon.Not.Roy.Astron.Soc.402:461-478,2010
Astronomy and Astrophysics
Astrophysics
a completely revised version can be found at astroph 0910.3481 and is published in MNRAS (reference see below)
Scientific paper
10.1111/j.1365-2966.2009.15893.x
We present an evolutionary disc model for the thin disc in the solar cylinder based on a continuous star formation history and a continuous dynamical heating of the stellar subpopulations. The vertical distribution of the stellar subpopulations are calculated self-consistently in dynamical equilibrium. The SFR and AVR of the stellar subpopulations are determined by fitting the velocity distribution functions of main sequence stars. The SFR shows a maximum 10 Gyr ago declining by a factor of 10 until present time. A constant SFR can be ruled out. The velocity dispersion of the stellar subpopulations increase with age according to a power law with index 0.375. The new scale heights lead to a best fit IMF with power-law indices of 1.5 below and 4.0 above 1.6 Msun, which has no kink around 1 Msun. Including a thick disc component results in slight variations of the thin disc properties, but has a negligible influence on the SFR. A variety of predictions are made concerning the number density, age and metallicity distributions of stellar subpopulations as a function of z above the galactic plane.
Jahreiss Hartmut
Just Andreas
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