Instantaneous recycling approximation in chemical evolution of galaxies

dc.contributor.advisorClayton, Donald W.en_US
dc.contributor.committeeMemberWolf, Richard A.en_US
dc.contributor.committeeMemberDufour, Reginald J.en_US
dc.creatorPantelaki, Irini A.en_US
dc.date.accessioned2018-12-18T21:18:43Zen_US
dc.date.available2018-12-18T21:18:43Zen_US
dc.date.issued1985en_US
dc.description.abstractThe purpose of this study is to determine the range of validity of the instantaneous recycling approximation (IRA) in the models for the chemical evolution of galaxies. To achieve this and in order to be able to follow the evolution of the gas mass and the gas metallicity with time without making the instantaneous recycling assumption, I constructed a simple numerical code. This same code was later converted to a form assuming the instantaneous recycling approximation and the two groups of solutions (with and without IRA) were compared. The results show that in the case of a star formation rate which at early times builds up to a maximum and later declines, a physically important departure from the instantaneous recycling approximation is observed in: a) The evolution of the gas mass at late times when the remaining gas mass density becomes a small fraction of the total density and b) the time evolution of the abundances in the interstellar gas of the elements contributed by the low mass stars. A less significant discrepancy between the two solutions (with and without IRA) appears at late times in the cases of the abundances of the elements whose origin are the intermediate and high mass stars.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent68 ppen_US
dc.identifier.callnoThesis Sp. Sci. 1985 Pantelakien_US
dc.identifier.citationPantelaki, Irini A.. "Instantaneous recycling approximation in chemical evolution of galaxies." (1985) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/104199">https://hdl.handle.net/1911/104199</a>.en_US
dc.identifier.digitalRICE1826en_US
dc.identifier.urihttps://hdl.handle.net/1911/104199en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titleInstantaneous recycling approximation in chemical evolution of galaxiesen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentSpace Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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