Abundances and Abundance Ratios in Stars and Hot Gas in Elliptical Galaxies
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Elliptical galaxies have well-studied stellar chemical properties by means of colours and absorption lines taken mostly in the optical part of the spectrum; it is natural to consider whether the theoretical interpretation of these observables can simultaneously provide a satisfactory explanation for the properties of their hot gas. X-ray spectra provide unique tools to study these reservoirs of gas in which evidence of the role played by recent SNe Ia activity and mass loss, due to stellar winds, can be found, as opposed to stars, whose chemical abundances mirror those at the time of the formation of the galaxy, 8-10 Gyr earlier. In this Chapter I, first briefly review the galaxy formation process as inferred from the analysis of the optical/chemical properties. I then introduce some basic tools to study the chemical evolution in the stars and in the gas of elliptical galaxies. Finally, I discuss the evolution of the abundances and the abundance ratios in such galactic components.
KeywordsStar Formation Abundance Ratio Stellar Population Elliptical Galaxy Star Formation History
This work was partially supported by the Italian Space Agency through contract ASI-INAF I/016/07/0. AP warmly thanks E.Cameron, K.Kornei for a careful reading of the manuscript, and C.Kobayashi for useful comments.
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