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Dispersal of massive star products and consequences for galactic chemical evolution

Published online by Cambridge University Press:  26 May 2016

M. S. Oey
M. S. Oey*
Affiliation:
Lowell Observatory, 1400 West Mars Hill Rd., Flagstaff, AZ 86001, USA

Abstract

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The processes that disperse the products of massive stars from their birth sites play a fundamental role in determining the observed abundances. I discuss parameterizations for element dispersal and their roles in chemical evolution, with an emphasis on understanding present-day dispersion and homogeneity in metallicity. Turbulence dominates mixing processes, with characteristic timescales of order 108 yr, implying significant dilution of metals into the ISM. This permits a rough estimate of the metallicity distribution function of enrichment events. Many systems, including the Milky Way and nearby galaxies, show metallicity dispersions that as yet appear consistent with pure inhomogeneous evolution. There are also systems like I Zw 18 that show strong homogenization, perhaps tied to small galaxy size, high star formation rate, and/or superwinds.

Type
Part 4. Feedback from Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 620 - 629
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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