Chemical evolution of dwarf irregular galaxies

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dc.contributor.advisorClayton, Donald D.en_US
dc.creatorPantelaki, Irini Andreasen_US
dc.date.accessioned2009-06-04T00:39:30Zen_US
dc.date.available2009-06-04T00:39:30Zen_US
dc.date.issued1989en_US
dc.description.abstractI propose here an interesting historical scenario for galaxy formation that may find application to the problems of dwarf irregular galaxies in general and of I Zw18 in particular. My purpose is to present calculations of the C:N:O ratios within this simple model in an attempt to explain the apparent paradox, that characterizes I Zw18, of having very low concentrations of C, N and O in HII regions of a current starburst (some forty times smaller than solar) and yet having nearly solar ratios for C/O and N/O. I first calculate concentrations in a hot ambient medium that suffers a "Hubble-like flow" wind in a galaxy that has experienced several bursts of star formation. This hot matrix contains HI clouds whose collisions initiate the starbursts. The ambient gas which is found to have large and variable X$\sb{\rm O}$, X$\sb{\rm C}$ and X$\sb{\rm N}$ concentrations, is mixed very slowly into the clouds, so that today a few percent of the cloud mass has been gathered from the hot medium by admixing, resulting in cloud concentrations comparable to those found in I Zw18. Different assumptions were tried for the details of the galactic history. The resulting ratios of the abundances in the clouds were found to be insensitive to these details.en_US
dc.format.extent149 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoThesis Sp. Sci. 1989 Pantelakien_US
dc.identifier.citationPantelaki, Irini Andreas. "Chemical evolution of dwarf irregular galaxies." (1989) Diss., Rice University. <a href="https://hdl.handle.net/1911/16277">https://hdl.handle.net/1911/16277</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/16277en_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.subjectAstronomyen_US
dc.subjectAstrophysicsen_US
dc.titleChemical evolution of dwarf irregular 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.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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