Self-regulated star formation and the evolution of the interstellar medium

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Models, Interstellar Matter, Star Formation, Stellar Evolution, Metallicity, Phase Transformations, Stellar Winds, Supernovae

Scientific paper

The effects of different processes and factors on the evolution of the interstellar medium (ISM) and the star-formation rate (SFR) are investigated. Calculations were performed using a one-zone model and taking into account stellar evolutionary time-scales and nucleosynthesis; stellar mass loss and energy release to the ISM by means of both supernovae and stellar winds; and a multicomponent ISM with phase transitions by means of condensation, evaporation, and ionization, as well as metal-dependent heating and cooling of the different phases. Results show that the metallicity is highest in the hot ICM, and that the difference between the metallicities of the hot and the cool gas phases depends strongly on the SFR (i.e., the lower the SFR, the higher the deviation between the gas phases). This is due to the fact that a lower SFR produces a lower SN rate.

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