Mathematics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.218..409l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 218, Feb. 1, 1986, p. 409-428.
Mathematics
214
Astronomical Models, Functions (Mathematics), Milky Way Galaxy, Star Formation, Stellar Mass, Abundance, Chemical Evolution, Mass Distribution, Mass To Light Ratios, Solar System, Star Formation Rate, Stellar Color, Time Functions
Scientific paper
It is proposed that the initial mass function (IMF) for star formation in galaxies is not a monotonic function of stellar mass but is double-peaked or bimodal. In models with a bimodal IMF the star formation rate can be strongly decreasing function of time, and stellar remnants can constitute an important or dominant fraction of the total mass. A bimodal model is constructed that accounts for all of the unseen mass in the solar neighbourhood as remnants, and it is shown that this model is consistent with all of the available constraints on the evolution and stellar content of the solar neighbourhood. The properties of the inner discs of our Galaxy and M83 can be accounted for by similar models in which the high-mass mode of star formation is more dominant than in the solar neighbourhood, and remnants constitute a large fraction of the mass.
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