Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..444h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 2, p. 444-451
Astronomy and Astrophysics
Astrophysics
24
Mass Distribution, Milky Way Galaxy, Solar Neighborhood, Star Formation Rate, Stellar Evolution, Stellar Luminosity, Color-Magnitude Diagram, Metallicity, Radial Velocity, Scale Height, Stellar Magnitude, Stellar Models
Scientific paper
This work is part of a program undertaken to study the evolution of our Galaxy using star-counts in several directions. Thanks to the recent advances in data processing, important sets of star-count data are now becoming available for the study of the galactic structure and the stellar populations in the Milky Way. Recent progress in the stellar evolution theory also suggest that galactic evolution studies should take advantage of this observational material. Star-count data include magnitude, colors and proper motions, but give no direct information on fundamental parameters such as distance, mass, or metallicity. Therefore, our ability to interpret these data rely on models of stellar population synthesis, which have been actively developed in the last decade. In most of these models the color-magnitude diagram for the disk population is fixed, and can give no information about the initial mass function and star formation rate (hereafter IMF and SFR). We describe here how such distribution for our galactic disk is computed for a given SFR and IMF, give the inputs of the model and take this occasion to investigate the solar neighborhood luminsoity function at magnitudes fainter than Mv approximately = 5. We discuss the slope of the IMF in the range (0.1, 1) solar mass. The consequences on the IMF of the Wielen dip feature and the decrease - or flattening - of the luminosity function at Mv = 12 are discussed. Analysis of star-count data and results concerning the galactic disk evolution will be presented ina future paper.
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