The initial mass function and global rates of mass, momentum, and energy input to the interstellar medium via stellar winds

Astronomy and Astrophysics – Astrophysics

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Interstellar Matter, Star Distribution, Stellar Evolution, Stellar Mass Ejection, Stellar Winds, Energy Transfer, Hertzsprung-Russell Diagram, Mass Transfer, Momentum Transfer, Statistical Analysis, Stellar Luminosity, Stellar Mass, Supernovae

Scientific paper

Published observational data are compiled and analyzed, using theoretical stellar-evolution models to determine the global rates of mass, momentum, and energy injected into the interstellar medium (ISM) by stellar winds. Expressions derived include psi = 0.00054 x (M to the -1.03) stars formed/sq kpc yr log M (where M is the initial mass function in solar mass units) and mass-loss = (2 x 10 to the -13th) x (L to the 1.25) solar mass/yr (with L in solar luminosity units). It is found that the wind/supernova injection of energy into the ISM and the mass loss from stars of 5 solar mass or more are approximately balanced by the dissipation of energy by cloud-cloud collisions and the formation of stars, respectively.

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