A different approach for the estimation of Galactic model parameters

Details A different approach for the estimation of Galactic model parameters A different approach for the estimation of Galactic model parameters

2004-07-20

arxiv.org/abs/astro-ph/0407426v1

Astronomy and Astrophysics

Astrophysics

14 pages, including 16 figures and 16 tables, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.08319.x

We estimated the Galactic model parameters by means of a new approach based on the comparison of the observed space density functions per absolute magnitude interval with a unique density law for each population individually, and via the procedure in situ for the field SA 114 ($l=68^{o}.15$, $b=-48^{o}.38$; 4.239 square-degree; J2000). The separation of stars into different populations has been carried out by their spatial distribution. The new approach reveals that model parameters are absolute magnitude dependent. The scale height for thin disk decreases monotonously from absolutely bright to absolutely faint stars in a range 265-495 pc, but there is a discontunity at the absolute magnitude $M(g^{'})=10$ where the squared secans hiperbolicus density law replaces the exponential one. The range of the scale-height for thick disk, dominant in the absolute magnitude interval $5

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