Galactic chemical evolution - Z versus ln(1/mu) relationship

Details Galactic chemical evolution - Z versus ln(1/mu) relationship Galactic chemical evolution - Z versus ln(1/mu) relationship

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..451c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 15, 1987, p. 451-459. Research supported by the Robert A. Welch

Astronomy and Astrophysics

Astrophysics

27

Abundance, Astronomical Models, Chemical Evolution, Galactic Evolution, Time Dependence, Cosmic Gases, Metallicity, Nuclear Fusion, Stellar Composition

Scientific paper

The ways in which a radial abundance gradient in a disk galaxy may be interpreted are reexamined, asking how metallicity Z depends upon gas mass fraction mu in analytic models characterized by a temporally varying history of metal-poor infall. Six different such models are studied, and it is shown that the metallicity versus gas fraction relationship is well approximated by an expression which is the analog of the Z = y ln(1/mu) relation for closed evolution. The approximation appears valid when the infall rate is nonneglible, but not so great that it dominates the gas budget.

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