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16 February 2025
 
  » arxiv » astro-ph/0107018

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The Galactic disk mass-budget : I. stellar mass-function and density
G. Chabrier ;
Date 2 Jul 2001
Subject astro-ph
AffiliationEcole Normale Superieure, Lyon; Visiting Miller Professor, UC Berkeley
AbstractIn this paper, we use the general theory worked out within the past few years for the structure and the evolution of low-mass stars to derive the stellar mass-function in the Galactic disk down to the vicinity of the hydrogen-burning limit, from the observed nearby luminosity functions. The accuracy of the mass-magnitude relationships derived from the afore-mentioned theory is examined by comparison with recent, accurate observational relationships in the M-dwarf domain. The mass function is shown to flatten out below $sim 1 msol$ but to keep rising down to the bottom of the main sequence. Combining the present determination below 1 $msol$ and Scalo’s (1986) mass function for larger masses, we show that the mass function is well described over the entire stellar mass range, from $sim 100 msol$ to $sim 0.1 msol$, by three functional forms, namely a two-segment power-law, a log-normal form or an exponential form, all normalized to the Hipparcos sample at 0.8 $msol$. Integration of this mass function yields a reasonably accurate census of the entire stellar population in the Galactic disk, and its volume and surface mass-density.
Source arXiv, astro-ph/0107018
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